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corundum
corundum
corundum Translucent to transparent mineral, aluminium oxide (Al
2O
3). It is found in igneous, pegmatitic and metamorphic rocks, occurring as pyramidal or prismatic crystals in the rhombohedral class and as granular masses. It is the hardest natural substance after
diamond. Gemstone varieties are sapphire and ruby. It is an industrial abrasive. Hardness 9; r.d. 4.
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Diamonds going down the corundum rabbit hole.(Letters)(Letter to the Editor)
Magazine article from: Jewelers Circular Keystone; 11/1/2004; ; 700+ words
; ...rapidly and enthusiastically going down the corundum rabbit hole. You would think that the ever present corundum example would give the diamond community...flux can "lower the melting point" of corundum. It cannot. A flux is simply a solvent...
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True North Gems-Bandito Staking Expands Corundum Dome Nickel Property
Newspaper article from: CCNMatthews Newswire; 3/7/2006; 700+ words
; ...the Bandito group, surrounding its wholly owned Corundum Dome property in the Watson Lake Mining District...exploration program over a portion of the historical Corundum Dome "corundum" prospect situated in the Toobally Lake area. Previous...
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Armenian synthetic corundum producer halts output due to crisis.
Newspaper article from: Russia & CIS Business and Financial Newswire; 11/6/2008; 700+ words
; Armenian synthetic corundum producer halts output due to crisis...an Armenian producer of synthetic corundum, shut down production on November...Interfax. Core production of synthetic corundum for jewelry, which was exported to...
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A new source of gem-quality cordierite and corundum in the Laramie Range of southeastern Wyoming.
Magazine article from: Rocks & Minerals; 9/1/2002; ; 700+ words
; ...near-gem-quality cordierite and corundum (fig. 1). The cordierite is hosted by quartzofeldspathic gneiss; the corundum is found in nearby chlorite-biotite...Location and Access The cordierite and corundum occurrence is located in Palmer Canyon...
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AGA corundum conference set for Vegas.(Gem Notes)(Accredited Gemologists Association)(Brief Article)
Magazine article from: Jewelers Circular Keystone; 5/1/2004; ; 636 words
; ...host a half-day conference titled "Corundum: An Expert Look At Treatments, Identification...examine many different types of treated corundums. The conference is a follow-up to...Vegas conference will devote more time to corundum treatments and ways to differentiate...
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Dinur launches $12 mln corundum-graphite line.
Newspaper article from: Russia & CIS Business and Financial Newswire; 2/10/2006; 463 words
; Dinur launches $12 mln corundum-graphite line YEKATERINBURG. Feb...launched a new $12 million line to make corundum-graphite products using technology...at the presentation that Dinur's corundum-graphite products could completely...
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Patent No. 7,566,500 Issued on July 28, Assigned to Showa Denko for Surface Modified Corundum, Resin Composition (Japanese Inventors)
News Wire article from: US Fed News Service, Including US State News; 7/29/2009; 402 words
; ...Japan, have developed a surface modified corundum and resin composition. The inventors...Patent & Trademark Office: "Corundum coated with a silicone compound containing...a resin composition containing the corundum, and an electronic device using an electronic...
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If you can't stand the heat, get out of the gem business, part II: a brief history of the heat-treating of corundum.
Magazine article from: Jewelers Circular Keystone; 6/1/2004; ; 700+ words
; ...Northbrook, Ill., gemologist and corundum expert Richard Hughes of Pala...Hughes says those first heated corundums allegedly originated from...So by 1977, almost all corundum was being heated. As Hughes...1978 JCK wrote about the "Corundum Crisis," a shortage of ruby...
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Corundum discoveries.(in Andilamena mining district)(Brief Article)
Magazine article from: Jewelers Circular Keystone; 10/1/2005; ; 700+ words
; ...Association ambassador to Madagascar Tom Cushman details another corundum discovery in the country, a ruby find in the Andilamena mining...According to Cushman, it's now becoming available. A third corundum deposit, not appraised at press time, was found south of...
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Corundum Ventures LP.(Brief Article)
Magazine article from: Private Equity Week; 8/9/1999; 433 words
; Corundum Ventures LP of Colorado Springs, Colo., raised $3.875 million from 15 investors through a private placement of partnership interests. Corundum Group Inc. of Colorado Springs is the general partner. The minimum investment...
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corundum
Book article from: The Columbia Encyclopedia, Sixth Edition
corundum , mineral, aluminum oxide, Al 2 O 3...and the opaque as abrasive materials. Corundum occurs in crystals of the hexagonal system...blue-gray to brown. Emery is a common corundum, used as an abrasive and distinguished...
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Industrial Minerals
Encyclopedia entry from: UXL Encyclopedia of Science
...include asbestos, barite, boron compounds, clays, corundum, feldspar, fluorspar, phosphates, potassium salts...semiconductors, and as a component of rocket propellants. Corundum Corundum is a naturally occurring form of aluminum oxide that...
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Grinding Wheel
Book article from: How Products Are Made
...a natural mineral containing iron and corundum) was used to cut and shape metals...carbide, a synthetic mineral harder than corundum. Eventually, manufacturers figured...an even better alternative, synthetic corundum or aluminum oxide. In creating this...
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Gemstones
Book article from: Chemistry: Foundations and Applications
...imitation diamonds. Ruby is a variety of corundum (Al 2 O 3 ) with a Mohs' hardness of...synthetically. Sapphire, like ruby, is made of corundum (Al 2 O 3 ) and has a hardness of 9...Quartz SiO 2 7 Topaz Al 2 SiO 4 F 2 8 Corundum Al 2 O 3 9 Diamond C 10 ions, which...
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Minnesota Mining & Manufacturing Company
Book article from: International Directory of Company Histories
...formed in 1902 to exploit the mineral corundum, a venture that almost bankrupted the...Ordway and John Ober, planned to mine corundum, a mineral harder than all others save...pile of useless rock (the “ corundum ” was actually anorthosite...
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