How To Use Pyrite In A Sentence
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Copper is known to be taken into solution as copper sulphate at the surface, and to be redeposited as chalcocite where these sulphate solutions come in contact with chalcopyrite or pyrite below.
The Economic Aspect of Geology
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bladed arsenopyrite
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In the periphery of the oxidation, copper mineralization occurs as chalcopyrite, bornite, tennantite and mispickel.
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A dressed product of copper works in South America, consisting of grains of native copper mixed with pyrite, chalcopyrite, mispickel, and earthy minerals.
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For example, microcrystalline pyrite is ubiquitous on the inner surface of cell walls, within lignified cell walls and in the middle lamella.
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In all appearance it is impregnated with nitre, if not with something more mischievous: we know that mundic, or pyrites, very often contains a proportion of arsenic, mixed with sulphur, vitriol, and mercury.
Travels through France and Italy
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The chief source of the arsenic of commerce is arsenical pyrites, or mispickel, which contains about 45 per cent. of arsenic (As).
A Text-book of Assaying: For the Use of Those Connected with Mines.
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Iron likewise combines with a considerable variety of substances other than oxygen; and some of these compounds, as for instance iron carbonate (siderite), iron silicate (chamosite, glauconite, etc.), and iron sulphide (pyrite), are locally mined as iron ores.
The Economic Aspect of Geology
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~ Much of the copper of commerce is made from chalcopyrite and bornite, and these ores are more difficult to work.
An Elementary Study of Chemistry
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This may be related to the presence of relatively large, probably late-diagenetic pyrite clusters in the bituminous limestones, whereas smaller framboids and crystals predominate in the black shales.
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Both the sandstone and andesite show strong quartz and chert veining and carry disseminated pyrite.
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The bodies of iron sulfide nodules in the Olentangy Shale are composed of fine-grained pyrite, and their surfaces are frequently covered with tabular crystals of marcasite.
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It is an alteration product of realgar, native arsenic, and, less commonly, arsenopyrite.
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But many of her anecdotes about her early years in broadcasting are revealing, particularly when they suggest how much pyrite the networks served up in what some critics call “the golden age of television.”
2009 January 22 « One-Minute Book Reviews
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The principal veins are from twelve to twenty-four inches wide, and carry besides gold, sulphurets, pyrite, galenite, &c.
North Carolina and its Resources.
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Many conclude that because pyrite is cubic, pyrrhotite must be hexagonal, as it often appears.
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A specimen from the replacement deposits of the Basin vein consists of several interlocking chalcopyrite crystals intergrown with clear quartz crystals.
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The minerals are deposited in lakes, deltas and meander further downstream, where they build up and form sedimentary rocks such as calcite, selenite, pyrite and dolomite.
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Through modification of operating condition, there are three classes of pure auriferous pyrite headmill.
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These crystals are associated with chalcopyrite, galena, quartz, calcite, epidote, and chlorite.
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There is a rough zonal arrangement of the ore minerals around the intrusive, gold and copper minerals (chiefly enargite and chalcopyrite) being more prominent near the intrusive, and argentiferous galena and zinc blende richer at greater distances.
The Economic Aspect of Geology
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Nickel is found in many ores as sulfides, arsenides, antimonides & oxides or silicates; chief sources include chalcopyrite; others are pyrrhotite, pentlandite, garnierite, niccolite, millerite.
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Arsenopyrite, cassiterite, molybdenite, wolframite, uraninite, and several of the common sulfides have all been observed at various locations.
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The ore shoot is mainly in the Molas Formation and is surrounded by a silicified envelope that contains galena, sphalerite, chalcopyrite, tetrahedrite, and pyrite.
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The fossils are also rich in the mineral pyrite, which is the work of decomposing bacteria; again, this suggests that they were once living.
Discover Blogs
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Chalcopyrite is occasionally found in the manto orebodies as small crystals on sphalerite and pyrite.
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Early investigators recognized bitumen (referred to then as carbon) as having a strong spatial relationship with gold, uraninite and pyrite.
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Some visitors gather around the sparkling amethyst geodes or the shining pyrite crystals.
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The integration of palynology with stratigraphical analysis represents a significant advance, by facilitating a detailed chronostratigraphic chart of the Iberian Pyrite Belt.
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The 20 vein is comprised of an assemblage of semi-massive irregular clusters of sulphide chalcopyrite, pyrrhotite, pyrite, and minor tetrahedrite.
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It is dominated by the deposition of calcite with minor pyrite, marcasite, barite, anhydrite and gypsum.
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Barite, sphalerite, and calcite are the most abundant vein minerals; pyrite, kaolinite, chalcopyrite, galena, and wurtzite are less common.
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Where pyrite crystals have been lost, it can be seen that quartz did not penetrate pyrite.
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~ The element is prepared by purifying the native arsenic, or by heating the arsenopyrite in iron tubes, out of contact with air, when the reaction expressed by the following equation occurs:
An Elementary Study of Chemistry
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The bluffs or hills which reach the river at this place, on the south, contain allum, copperas, cobalt which had the appearance of soft isinglass, pyrites, and sandstone, the two first very pure.
History of the Expedition under the Command of Captains Lewis and Clark, Vol. I. To the Sources of the Missouri, Thence Across the Rocky Mountains and Down the River Columbia to the Pacific Ocean. Performed During the Years 1804-5-6.
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It generally occurs as crystalline druses on chalcopyrite, tetrahedrite, and other minerals and is sometimes associated with polybasite and dyscrasite.
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It never wrinkles like pyrites, never rusts nor tarnishes, even after centuries lyin ' underwater.
PAINT THE WIND
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Tiny crystals of hematite, goethite, chalcopyrite, marcasite, and dolomite are common and make excellent micromounts.
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The pyrite has a small amount of arsenopyrite in it, and when this is burned arsenious oxide is formed as
An Elementary Study of Chemistry
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The occurrence is in deformed, silicified marble accompanied by forsterite, diopside, zcolites, scapolite, and pyrite.
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Other minerals mentioned from the mine by Dunham include galena, sphalerite, pyrite, chalcedony, and minor marcasite and pyrrhotite.
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Crystals to 3 cm are reported, although most cubanite occurs in isolated grains, granular masses, or thin lamellae in chalcopyrite.
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The main ore minerals are galena, chalcopyrite, sphalerite, and tetrahedrite that are associated with quartz and barite gangue.
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Mineralization at WC2 Showing is hosted in shears and fractures and comprises disseminated and blebby chalcopyrite with weak to moderate malachite.
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The demineralized (De-ash) and de-pyrite (Dep) raw Yima coal was pyrolyzed in a fluidized-bed reactor in inert atmosphere to examine the sulfur removal efficiency.
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Other common minor constituents of eclogite include kyanite, orthopyroxene, rutile, amphibole, pyrite, and white mica.
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They contained pyrites, carbonated iron-ore, traces of sulphuretted silver (glasserz), and grey copper-ore (fahlerz).
Travels to the Equinoctial Regions of America
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Access to the pit is prohibited, but excellent specimens of calcite scalenohedra, dolomite rhombohedra, pyrite, and marcasite have been collected from the pit's east wall.
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Iron and copper sulfides of this region are predominately pyrite, pyrrhotite, chalcopyrite, arsenopyrite, bornite, and marcasite.
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There is a rough zonal arrangement of the ore minerals around the intrusive, gold and copper minerals (chiefly enargite and chalcopyrite) being more prominent near the intrusive, and argentiferous galena and zinc blende richer at greater distances.
The Economic Aspect of Geology
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Other than clay minerals, calcite and pyrite are the most common secondary minerals present.
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The present utilize condition of pyrite slag and the affect factors to the cyanide process to reclaim gold and silver were reviewed.
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The Yaogangxian mine is a world-class locality for not only fluorite but also for arsenopyrite, bournonite, stannite, wurtzite, and ferberite.
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In the latter locality arsenopyrite is found associated with pyrite in a gangue of quartz, forming a series of parallel stringers in gneiss close to a basic dike.
The Economic Aspect of Geology
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The fish, in turn, studied me with its round, obsidian eyes, which had a gold lining to their perimeter, like pyrite.
Fish Story
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Iron is found combined with sulphur in pyrrhotine and pyrites, and together with arsenic in mispickel.
A Text-book of Assaying: For the Use of Those Connected with Mines.
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If arsenopyrite is heated in a current of air, what products are formed?
An Elementary Study of Chemistry
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The pods were composed of large masses of black sphalerite containing vugs of petzite on gold, galena, rhodochrosite, chalcopyrite, and pyrite.
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Other sulfides, including pyrite, marcasite, chalcopyrite, and pyrrhotite, are occasionally found as well.
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The minerals are deposited in lakes, deltas and meander further downstream, where they build up and form sedimentary rocks such as calcite, selenite, pyrite and dolomite.
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Associated minerals in the high-grade veins are calcite, ‘smaltite,’ nicoline, bismuth, and lesser pyrargyrite, proustite, acanthite, millerite, and chalcopyrite.
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Authigenic pyrite is the normal product of anoxic sulfate reduction in marine sediments.
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One quick stop was made at the abandoned New First of May mine, where on the ore pile we found galena, pyrite, arsenopyrite, and fluorite.
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Sulphur in blende, 375 in burnt ore, 377 in chalcocite, 376 in coal, 419 in copper, 207 in copper pyrites, 376 in mispickel, 376 in pyrites, 370, 376
A Text-book of Assaying: For the Use of Those Connected with Mines.
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Many of these calcite crystals and crystal groups are partially or completely covered with an overgrowth of pyrite.
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(As_ S_ ), as oxide (As_ O_ ), and as a constituent of many metallic sulphides, such as arsenopyrite (FeAsS).
An Elementary Study of Chemistry
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Below this is a zone carrying copper in the form of chalcopyrite, enriched by chalcocite deposition from above, ranging in thickness up to 400 feet.
The Economic Aspect of Geology
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The specimen was a classic Lengenbach assemblage: sugary white dolomite matrix, realgar, minor pyrite, and a massive metallic gray sulfosalt that had been labeled as ‘sartorite.’
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The lode is a large irregular one of pure arsenical pyrites carrying, in addition to gold and silver, nickel and cobalt.
Getting Gold: a practical treatise for prospectors, miners and students
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Although relatively simple, this system offers a wide range of minerals to depict (e.g., fluorite, halite, pyrite, and so forth).
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Vein minerals are ferroan dolomite, barite, calcite, pyrite, and quartz.
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It was formerly supposed that most of the chalcocite was of this origin; but as chalcocite is found in important amounts with enargite and chalcopyrite to great depths (now 3,500 feet), where the veins are still rich and strong, it begins to appear that much of the chalcocite is of primary origin.
The Economic Aspect of Geology
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Fine specimens of silver associated with stromeyerite, bornite, and chalcopyrite have been recovered from the Silver King mine, Pinal County.
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Tiny crystals of hematite, goethite, chalcopyrite, marcasite, and dolomite are common and make excellent micromounts.
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The analysis of the iron bearing mineral compositions indicates that the major iron bearing minerals in the rocks are magnetite, maghemite, hematite, pyrite and siderite.
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There were shops full of green and purple fluorite, ferberite and arsenopyrite, and spessartine and stibnite.
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Cornishmen 'blue elvan:' this diorite, composed of felspar and the hardest hornblende, contains granular iron and pyrites like silver.
To The Gold Coast for Gold, Vol. II A Personal Narrative
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In the fossilisation process, the original organic parts of the shark's tooth are replaced by minerals such as iron pyrites and silica.
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A new type of effective complex coagulant polysilicate aluminum ferric salt(PSAF) was prepared from coal gangue and pyrite slag and used as coagulant in the treatment of papermaking wastewater.
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The lower Cubagua Formation consists of gray shale with glauconite, abundant pyrite nodules, gray limonite, and some sandy intercalation with fine clastics probably carried out by turbidity currents.
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Arsenic sulphides, arsenopyrite: hot sublimate is dark, cold varies from yellow to red.
1.1 Blow pipe assaying
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Pseudomorphs of marcasite, chalcopyrite, pyrite, arsenopyrite, pyrargyrite, magnetite, and quartz after pyrrhotite have been reported.
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Copper is known to be taken into solution as copper sulphate at the surface, and to be redeposited as chalcocite where these sulphate solutions come in contact with chalcopyrite or pyrite below.
The Economic Aspect of Geology
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The main ore minerals are galena, chalcopyrite, sphalerite, and tetrahedrite that are associated with quartz and barite gangue.
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The unoxidized sections consist primarily of marmatite ore, which is composed primarily of pyrite, marmatite, galena, siderite, and minor chalcopyrite.
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These shistose pyrites being composed principally of coal, flint, alumina, and sulphuret of iron — the latter in excess — it was necessary to separate the sulphuret of iron, and transform it into sulphate as rapidly as possible.
The Mysterious Island
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The central potassic core normally contains low-grade mineralization consisting of minor chalcopyrite, molybdenite, and pyrite.
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Mineralization consists of quartz-albite-calcite veining with disseminated pyrite, pyrrhotite and arsenopyrite hosted in pervasively silicified, brecciated siltstone and wacke.
Marketwire - Breaking News Releases
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While the large presence of silicium and aluminum-compounds improves the quality of slate, its quality is impaired by the presence of lime, pyrites and carbon in higher quantities.
1. Technical requirements for Asbestos substitutes
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The most common arsenic mineral is arsenopyrite, a compound of iron, arsenic, and sulfur.
Arsenic
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Both Ara Group pyrite and anhydrite are characterized by highly variable [delta] 34 S values.
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Iron and copper sulfides of this region are predominately pyrite, pyrrhotite, chalcopyrite, arsenopyrite, bornite, and marcasite.
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I found no cavity (druse), no crystallized substance, not even rock-crystal; and no trace of pyrites, or any other metallic substance.
Travels to the Equinoctial Regions of America
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Calcic amphiboles, including hornblende and actinolite are abundant, and probably are alteration products, which also include albite, orthoclase and rare pyrite.
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The assemblage present included quartz, chalcopyrite, pyrite, sphalerite, magnetite, and hematite.
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However, it is actually an ‘auriferous pyrite,’ a bona fide gold ore, but not gold per se, so it was relabeled, moved to the pyrite drawers, and not considered further.
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They are rather characteristic of the oxide zones of certain arsenical metallic ores, and are believed in many cases to have formed from arsenopyrite.
The Economic Aspect of Geology
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New [delta] 34 S data from anhydrite and pyrite of the Ara Group in Oman extend this record to Arabia.
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The skarns also contain hornblende, calcite, pyroxene, tremolite, pyrrhotite, molybdenite, galena, chalcopyrite, arsenopyrite, garnet (probably andradite or grossular), and pyrite.
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I have septaria of this kind, in which, besides pyrites, iron-ore, calcareous spar, and another that is ferruginous and compound, there is contained siliceous crystals; a case which is not so common.
Theory of the Earth~ Part 2 (historical)
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When calcined zinciferous pyrites have to be examined, the estimation of zinc is similar to that employed in the analysis of zinc ore.
Scientific American Supplement, No. 455, September 20, 1884
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Besides the colouring principle of the lazulite, there are always more or less mica and iron pyrites, the latter a lustrous yellow bisulphide of iron, which has often been mistaken for pellets of gold.
Field's Chromatography or Treatise on Colours and Pigments as Used by Artists
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Iron, copper, and arsenical pyrites, antimony, galena, molybdenite, zinc blende, and wolfram were treated in the above manner with similar results.
Getting Gold: a practical treatise for prospectors, miners and students
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The Yaogangxian mine is a world-class locality for not only fluorite but also for arsenopyrite, bournonite, stannite, wurtzite, and ferberite.
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Gold occurs in quartz veins with chalcopyrite, galena, pyrite, and sphalerite.
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Some of the best bornite specimens consist of plates of 5-mm blue-gray crystals upon which are perched large, complex chalcopyrite crystals.
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Eckel reported the presence of acicular pyrite crystals.
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The mineralization consists of fine disseminated pyrite in the deformed quartz-carbonate vein that has undergone mylonitization and boudinage in the shear zone.
Marketwire - Breaking News Releases
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At Azegour, Morocco, uraninite occurs in tactite with molybdenite, chalcopyrite, barite, pyrite, hematite, and garnet.
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A set of specimens was exhibited by the Ellenville Zinc Company, consisting of strikingly beautiful crystalline masses of quartz galina, sphalerite and chalcopyrite and specimens of the rare mineral, brookite.
New York at the Louisiana Purchase Exposition, St. Louis 1904 Report of the New York State Commission
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These molds are now lined with crystals of celestine, fluorite, pyrite, strontianite, dolomite, calcite, sphalerite, and barite.
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In places the chalcopyrite has been changed to the delicate green carbonate of copper called malachite.
The Western United States A Geographical Reader
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Diamonds, pyrite and garnet are examples of cubic crystals.
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Similar to the deleterious metals, element contents which would be worth recovering and marketing in the form of by-products are also often overlooked; for example, zircon sand from alluvial deposits, gold-containing pyrite and arsenopyrite from complex sulphide veins.
Chapter 6
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Copper minerals occurring in deposits large enough to mine include azurite (Cu3 (CO3) 2 (OH) 2), malachite (Cu2CO3 (OH) 2), tennantite ((Cu, Fe) 12As4S13), chalcopyrite (CuFeS2), and bornite (Cu5FeS4).
Copper
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The natural inference was that as the veins were followed deeper the proportion of chalcocite would rapidly diminish, and that a leaner primary zone of chalcopyrite, enargite and other primary minerals would be met.
The Economic Aspect of Geology
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Matrix minerals of the septaria are ferroan dolomite, quartz, calcite, and pyrite.
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Lovering, Tweto, and Lovering noted small veinlets of tetrahedrite cutting interbanded chalcopyrite and bornite.
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In the orebody galena occurred as large masses associated with pyrite, chalcopyrite, and tennantite.
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Dr. HENNIGH: The fine sparkle you see is pyrite, which is fool's gold.
Old Wyoming Mines Reopen After Gold Prices Soar
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Vein minerals are barite, calcite, chalcopyrite, galena, pyrite, and sphalerite.
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Associated minerals include various pyroxenes and zeolites in addition to the more familiar lazurite, sodalite, pyrite, and carbonates.
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Pyrites often contain several nonferrous metal and noble metal elementS and be possessed of comprehensive utilization.
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The ore zone is a combination of veinlets, lenses, and nests of pyrite and quartz.
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Mixed copper mineralization may contain both chalcocite-covellite and chalcopyrite-bornite mineralization.
The Earth Times Online Newspaper
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The wall rock was highly altered and consisted of a groundmass of pyrophyllite and fine-grained pyrite.
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Under weathering conditions pyrite oxidizes, the sulphur forming sulphuric acid, -- an important agent in the secondary enrichment of copper and other sulphides, -- and the iron forming the minerals hematite and limonite in the shape of a "gossan" or "iron-cap.
The Economic Aspect of Geology
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In terms of finance alone, last night was the difference between digging gold or iron pyrites.
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The gold-bearing rock is a heavy ledge of brown, ferruginous mica-schist, which is impregnated with iron pyrites in a state of minute subdivision, and abounds in garnets.
The Resources of North Carolina: Its Natural Wealth, Condition, and Advantages, as Existing in 1869. Presented to the Capitalists and People of the Central and Northern States
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The main ore minerals are galena, chalcopyrite, sphalerite, and tetrahedrite that are associated with quartz and barite gangue.
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At Goldfield, Nevada, native gold is found in surface igneous flows of a dacite type, which have undergone extensive hydrothermal alterations characterized by the development of alunite (a potassium-aluminum sulphate), quartz, and pyrite.
The Economic Aspect of Geology
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LAV-140 was drilled on Section 800NE and intersected alternating andesite and tonalite containing variable chalcopyrite and pyrite.
Marketwire - Breaking News Releases
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The fine-grained sediment of the matrix consists chiefly of pyrite or marcasite, and their surfaces are often covered with outward-projecting crystals of pyrite or marcasite.
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The assemblage present included quartz, chalcopyrite, pyrite, sphalerite, magnetite, and hematite.
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The common presence of limonite suggests that there was a significant quantity of pyrite in the area prior to oxidation.
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Copper-silver ore, located in the cores of the chimneys, consists primarily of chalcopyrite, tetrahedrite, pyrite, and galena along with electrum and a number of minor silver minerals.
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Matrix minerals of the dolostone septaria are ferroan dolomite, quartz, calcite, and pyrite.
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The ore - hunting indicator is of calcite - potassium feldspar veins containing pyritohedron pyrite.
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~ -- In assaying ores containing a large proportion of pyrites or mispickel, or both, the best plan is to take a portion and calcine so as to convert it into a product of the kind just considered.
A Text-book of Assaying: For the Use of Those Connected with Mines.
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The mineralization consists of fine disseminated pyrite in the deformed quartz-carbonate vein that has undergone mylonitization and boudinage in the shear zone (less than Boucher 1).
Marketwire - Breaking News Releases
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It was the largest orebody found in the Rocky Point zone of the Sawatch Quartzite; ores were of the zinc manto type with marmatite, argentiferous galena, pyrite, and siderite.
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When it rises through fractures in the surrounding solid rocks, these metals are precipitated, normally as the minerals chalcopyrite, bornite, and molybdenite.
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The demineralized (De-ash) and de-pyrite (Dep) raw Yima coal was pyrolyzed in a fluidized-bed reactor in inert atmosphere to examine the sulfur removal efficiency.
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The process, termed pyrite oxidation, is enhanced when water moves through and over the surfaces of acid bearing rock exposed through mining activities which disturb the underlying geology.
Mail & Guardian Online
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Minerals such as wolframite, arsenopyrite, fluorite, and quartz are well known from this mine.
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Galena may also overgrow clausthalite, and replace pyrite and chalcopyrite.
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Barite, sphalerite, and calcite are the most abundant vein minerals; pyrite, kaolinite, chalcopyrite, galena, and wurtzite are less common.
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Some of the chalcopyrite is rimmed by bornite and more rarely by covellite and/or chalcocite.
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Vein minerals are barite, calcite, chalcopyrite, kaolinite, pyrite, sphalerite, and wurtzite.
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The ore bodies consist of masses of chloritic and sericitic schists, intermixed with pyrite and chalcopyrite.
North Carolina and its Resources.
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The occurrence is in deformed, silicified marble accompanied by forsterite, diopside, zcolites, scapolite, and pyrite.
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Vein minerals are barite, calcite, chalcopyrite, galena, pyrite, and sphalerite.
-
But many of her anecdotes about her early years in broadcasting are revealing, particularly when they suggest how much pyrite the networks served up in what some critics call “the golden age of television.”
2009 January 22 « One-Minute Book Reviews
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It is dominated by the deposition of calcite with minor pyrite, marcasite, barite, anhydrite and gypsum.
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On the dumps I found galena, pyrite, and rugs full of quartz, dolomite, and a few tiny, water-clear fluorites.
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The utilization of nitrogen and energy sources by Thiobacillus ferrooxidans was investigated, and the removal of sulfur from coal pyrite exposed to the air for different time was studied.
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Vein minerals are barite, calcite, chalcopyrite, kaolinite, pyrite, sphalerite, and wurtzite.
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Pseudomorphs of marcasite, chalcopyrite, pyrite, arsenopyrite, pyrargyrite, magnetite, and quartz after pyrrhotite have been reported.
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It was formerly supposed that most of the chalcocite was of this origin; but as chalcocite is found in important amounts with enargite and chalcopyrite to great depths (now 3,500 feet), where the veins are still rich and strong, it begins to appear that much of the chalcocite is of primary origin.
The Economic Aspect of Geology
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Resetting of the [delta] 34 S values in anhydrite and pyrite by diagenetic fluids seems unlikely in the present case, because diagenesis occurred in a largely closed system and did not involve significant fluid movement.
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Scientific periodicals throughout Europe published and republished accounts that, tying color to classic roles as a chemical indicator and mineralogical descriptor, linked colored substances to their use as coloring materials. 22 The influences could be subtle; an article about pyrites and vitriols might suggest new pigments and reformulated inks and dyes, if one were familiar with the role they played in those processes. 23
The Creation of Color in Eighteenth-Century Europe
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They build up on sheltered exposures of fine-grained, porous pyrite-bearing rocks, such as shale or bituminous coal, after long dry spells.
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Iron likewise combines with a considerable variety of substances other than oxygen; and some of these compounds, as for instance iron carbonate (siderite), iron silicate (chamosite, glauconite, etc.), and iron sulphide (pyrite), are locally mined as iron ores.
The Economic Aspect of Geology
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Arsenopyrite, cassiterite, molybdenite, wolframite, uraninite, and several of the common sulfides have all been observed at various locations.
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In January, the main line -- which starts at $115 for a pyrite bracelet adorned with a pearl and $270 for a wood beaded bracelet with a pearl and two diamond rondelles -- was picked up by two retailers.
Theresa Bruno: The Sliced Collection
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Lapis lazuli is an ornamental rock formed by the regional metamorphism of limestone; it has blue lazurite (sodium calcium aluminosilicate sulphate), white calcite, and pyrite as its main constituents.
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Associated minerals in the high-grade veins are calcite, ‘smaltite,’ nicoline, bismuth, and lesser pyrargyrite, proustite, acanthite, millerite, and chalcopyrite.
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The floor of the cavern was covered with heaps of water-worn fragments of quartzose rock, containing copper pyrites, in some of which the cavities were covered by a deposit of greenish calcedony.
Narrative of a Survey of the Intertropical and Western Coasts of Australia Performed between the years 1818 and 1822 — Volume 1
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Other minerals that are present in this zone include pyrite and epidote.
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Similarly, silver has been described replacing a variety of silver minerals, pyrite, and galena.
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Various reflecting surfaces were used: polished metallic rocks such as obsidian, pyrite, and iron; rock crystal; and an alloy of rose copper and tin, plus an alchemical brew consisting of white arsenic, red tartar, and nitre.
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A set of specimens was exhibited by the Ellenville Zinc Company, consisting of strikingly beautiful crystalline masses of quartz galina, sphalerite and chalcopyrite and specimens of the rare mineral, brookite.
New York at the Louisiana Purchase Exposition, St. Louis 1904 Report of the New York State Commission
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The mordenite is associated with a hemispherical form of pale yellow calcite and cubic pyrite.
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Some older analyses show the presence of small amounts of NJ, Co, and Cu, but these are almost invariably found to reflect the presence of tiny exsolved grains of such minerals as chalcopyrite and pentlandite.
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The assemblage present included quartz, chalcopyrite, pyrite, sphalerite, magnetite, and hematite.
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Minimal fractionation accompanies the precipitation of pyrite from dissolved sulphide.
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There were shops full of green and purple fluorite, ferberite and arsenopyrite, and spessartine and stibnite.
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The floor of the cavern was covered with heaps of water-worn fragments of quartzoze rock containing copper pyrites, in some of which the cavities were covered by a deposit of greenish calcedony.
The History of Australian Exploration from 1788 to 1888
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Generally associated minerals included other silver amalgams, covellite, and pyrite.
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Gold occurs in quartz veins with chalcopyrite, galena, pyrite, and sphalerite.
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The 2cm chalcopyrite crystals are striated but quite clean, with no tarnish or coating.
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The lode is a large irregular one of pure arsenical pyrites, existing in a felsite dike near the sea coast.
Scientific American Supplement, No. 841, February 13, 1892
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Ores consist of pyrite, blende, aurum, zinckenite, tennantite, antimonite, realgar, and orpiment, belong to typical Low-temperature minerals assemblage.
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So instead of making efficiency gains using exotic but expensive thin-film solar cell materials like cadmium telluride, the industry will likely turn to cheap alternatives such as pyrite and copper oxide.
New Scientist - Online News
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The bodies of many smaller concretions are surrounded by a shell of fine-grained pyrite.
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The primary deposition was of chalcopyrite and other copper sulphides, together with garnet, diopside, and other minerals known to have required high temperature in their formation.
The Economic Aspect of Geology
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Some pyrrhotite is relatively unstable in humid environments, decrepitating like pyrite.
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The importance of the Iberian Pyrite Belt as a world-class massive sulphide province extends this work to other metallogenic provinces where massive sulphide deposits occur associated with reduced sedimentary rocks.
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Nodules of pyrite whose surfaces are covered with tabular marcasite crystals are present in the Olentangy Shale in Pickaway and Pike Counties (Atlanta and Latham sites).
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We learn, for instance, that the mineral grains inside the pebble were eroded off the long-lost continent of Avalonia more than 600 million years ago, and, more recently, around 420 million years ago, tiny crystals of fool's gold pyrite settled on the ancient mud to fill in the body cavities of tiny animals whose bodies had sunk into the muck.
Rock of Ages
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June saw them undertaking the long journey to the Glenover phosphate deposit in the Northern Province to look for apatite, monazite, pyrite, magnetite, calcite, anatase, and rutile.
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In places pyrite framboids and polyhedra occur associated with the ferroan dolomite rhombs, the latter aligned as they would have been within the original calcite.
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(particularly pentlandite, but also millerite, niccolite, and others), which are found at Sudbury intergrown with the iron and copper sulphides, pyrrhotite and chalcopyrite; and the hydrated nickel-magnesium silicates (garnierite and genthite), which are products of weathering.
The Economic Aspect of Geology
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One gram of copper pyrites, blende, fahlerz, or mispickel, yields 7 or 8 grams of lead, whilst 1 gram of antimonite will give 6, and 1 gram of galena only
A Text-book of Assaying: For the Use of Those Connected with Mines.
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We have also seen several specimens in which pyrite has replaced a hexagonal mineral that was probably pyrrhotite.
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The assemblage present included quartz, chalcopyrite, pyrite, sphalerite, magnetite, and hematite.
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Chalcopyrite is occasionally found in the manto orebodies as small crystals on sphalerite and pyrite.
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Frank Knaus found crude 3.1-cm pyrite cubes covered with a crust of limonite.
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The copper in these deposits occurs as primary chalcopyrite (CuFeS2) or the important secondary copper mineral chalcocite (Cu2S).
Rhenium
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It said the qualified person for the project has notified Brookemont that crews have uncovered a 4.5 km trend of gold related arsenic geochemistry anomaly, with visible arsenopyrite in amphibolitic gneiss with quartz veining cutting across the property.
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