How To Use Corundum In A Sentence
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From Pliocene time the shallow emplacement of intrusive bodies resulted in thermal metamorphism (forming, for example, biotite, cordierite, andalusite, K-feldspar and corundum in pelites) and hydrothermal activity.
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Aluminum-silicon composite ultra-fine fume is a fume mineral additive with utility model patent, which won Fume Mineral Admixtures Extracted from Corundum Soot and Production of Synthetic Potash.
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Most natural corundum is of industrial quality, but transparent to translucent varieties with their adamantine to vitreous luster potentially yield gemstones.
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The natural materials include the minerals staurolite, quartz, diamond and corundum.
Garnet
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The same tendency to rely upon color causes many in the trade to call all yellow stones "topaz" whether the species be corundum (oriental topaz), true topaz (precious topaz), citrine quartz (quartz topaz), heliodor (yellow beryl), jacinth
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public
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Then we have the "amethyst" sapphire, which varies from a red to a blue purple, being richer in colour than the ordinary amethyst, which is a form of violet-coloured quartz, but the corundum variety, which, like its companions, is called the "oriental" amethyst, is both rarer and more precious.
The Chemistry, Properties and Tests of Precious Stones
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Some representative oxide minerals include corundum, cuprite, and hematite.
Composition of rocks
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Diamond has been assigned a hardness value of 10, only a single point higher than corundum on Mohs scale, although it is far harder than this would indicate.
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In crystal form, aluminum oxide is called corundum, sapphire or ruby (depending on the color), and it is among the hardest substances known.
Rusting Aluminum « Isegoria
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He also found particles of gemstones such as corundum, garnet, rutile, and argentite.
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Also on a hillside to the north is a contact metamorphosed bed rich in small, dark blue, platy corundum crystals.
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One of these occurs at Baggot's Rock, where specks of corundum are found.
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Red gem-quality corundum is known as ruby; all other colors of gem corundum are referred to as sapphire, with a prefix denoting the color of the stone.
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Corundum occurs as an accessory mineral in some metamorphic rocks, such as mica schist, gneiss, and crystalline limestone.
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Several authors mention the use of emery, which technically is a fine sand made from a very hard form of aluminum oxide (corundum) which has a Mohs scale hardness of 9, but the term has been used loosely as "emery" per se was not available in Egypt.
Interactive Dig Hierakonpolis - Hierakonpolis 2009 - Field Note 3
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Sapphire comes in every color (except red, because red corundum is called ruby) and is one of the hardest/most durable gems next to diamond.
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Man-made ruby is actually red colored “corundum” which has extreme hardness, tends to be self-lubricating, and not only naturally polishes the ends of the pinions, it causes extremely little wear on them with very low friction . . . extending the life of the movement by decades.
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Although blue corundum, zircon, and tourmaline occur in Colorado, they are not known to produce gems.
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In addition, poor-quality, translucent to cloudy, dark gray cordierite is also present, as is corundum with well-developed rhombohedral parting that tends to crumble.
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In 1995 field reconnaissance in the central Laramie Range of southeastern Wyoming led to the discovery of a new source of gem- and near-gem-quality cordierite and corundum.
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Several Colorado gem minerals (lazurite and the state's minor occurrences of corundum and cordierite) form in metamorphic rocks.
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All granites are peraluminous as implied by the ubiquity of normative corundum.
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Also, diamond is well known as host for a wide variety of inclusions such as graphite, magnetite, ilmenite, garnet (usually pyrope), chrome-diopside, chlorite, biotite, phlogopite, and even corundum.
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The grayish-blue, partly gemmy cordierite, when first discovered in the early twentieth century, was mistakenly reported as corundum.
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Thus, further investigations of Wyoming's vermiculite deposits may lead to the discovery of other corundum occurrences.
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Chapters 2-19 describe eighteen specific traditional gemstones or families, beginning with corundum and ending with rhodonite.
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In the 1980s, geologists in Moscow found several small diamonds and minerals, such as zircon, garnet, and corundum, in the alluvia of the River Karla.
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He also found particles of gemstones such as corundum, garnet, rutile, and argentite.
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In summary, the presence of additional occurrences of gem-quality corundum and cordierite in Wyoming needs to be seriously considered
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The grayish-blue, partly gemmy cordierite, when first discovered in the early twentieth century, was mistakenly reported as corundum.
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Corundum occurs as an accessory mineral in some metamorphic rocks, such as mica schist, gneiss, and crystalline limestone.
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First, to prove beryllium could diffuse into corundum and create a color change, he heated pink sapphires with beryllium and got yellow rims.
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Aluminum-silicon composite ultra-fine fume is a fume mineral additive with utility model patent, which won Fume Mineral Admixtures Extracted from Corundum Soot and Production of Synthetic Potash.
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In 1995 field reconnaissance in the central Laramie Range of southeastern Wyoming led to the discovery of a new source of gem- and near-gem-quality cordierite and corundum.
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Herein also is the kind of corundum known as emery, and esteemed for its polishing properties.
How to See the British Museum in Four Visits
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Engineers to say: Red corundum in bands of crystalline limestone under swamp.
WICKED: THE LIFE AND TIMES OF THE WICKED WITCH OF THE WEST
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Secondly, the effect of particle size and additions of kyanite on properties of mullite-corundum was studied.
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In Wyoming, corundum has been found in gneiss, pelitic schist, and vermiculite schist.
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The largest plant operated for gems exclusively was that in Alexander county, where emerald, hiddenite, beryl, rarely terminated rutile, and exquisite shades of garnets were found; and next to this should be mentioned Corundum Hill in Macon county, where rubies, sapphires, beryls and garnets are gathered incidentally in washing corundum for the markets.
North Carolina and its Resources.
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Reports of gem-quality corundum are rare in Wyoming, although both ruby and sapphire have been noted.
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This is, of course, ludicrous because corundum and quartz are mutually exclusive.
