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Corundum - Wikipedia
Corundum is a crystalline form of aluminium oxide (Al 2 O 3 ) typically containing traces of iron, titanium, vanadium, and chromium . It is a rock-forming mineral. It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure.
en.wikipedia.org
en.wikipedia.org
Corundum - Virtual Museum of Minerals and Molecules
Corundum is an aluminum oxide mineral of the oxides and hydroxides group, with structural formula Al2O3.
virtual-museum.soils.wisc.edu
virtual-museum.soils.wisc.edu
Corundum | Aluminum Oxide, Gemstone, Abrasive | Britannica
Corundum, naturally occurring aluminum oxide mineral (Al2O3) that is, after diamond, the hardest known natural substance.
www.britannica.com
www.britannica.com
corundum
corundum (kɒˈrʌndəm) Also 8 corivindum, -vendum, coriundum, 9 corundon. [a. Tamil kurundam, in Telugu kuruvindam, Hindī kurunḍ; Skr. kuruvinda ‘ruby’. Cf. also corindon.] 1. A crystallized mineral belonging to the same species as the sapphire and ruby, but opaque or merely translucent, and varying i...
Oxford English Dictionary
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GIA's Gubelin Gem Project: Corundum
Corundums (ruby and sapphires) occur in all colors of the spectrum, and have remained popular gemstones from ancient times to the present day.
www.gia.edu
www.gia.edu
Corundum: Mineral information, data and localities.
Corundum is used as an abrasive ("Emery"), and the gem varieties of corundum are better-known as Ruby and Sapphire. Corundum in petrology ...
www.mindat.org
www.mindat.org
Corundum (structure)
Structure
The corundum structure has the space group . The corundum-like structure with the composition A2BB'O6 is called double corundum. A list of examples are tabulated below.
wikipedia.org
en.wikipedia.org
Corundum Value, Price, and Jewelry Information
Corundum is the hardest mineral known and is very compact and dense, with no cleavage. As a result, corundum is one of the best of all jewelry stones.
www.gemsociety.org
www.gemsociety.org
Corundum: Use as a Gemstone, Abrasive, Refractory - Geology.com
Corundum is an exceptionally hard and tough material. It is the third-hardest mineral, after diamond and moissanite.
geology.com
geology.com
Corundum - Minerals Education Coalition
Corundum is a crystalline form of aluminum oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral.
mineralseducationcoalition.org
mineralseducationcoalition.org
Corundum | Earth Sciences Museum | University of Waterloo
Corundum is a very hard, tough and stable mineral. For all practical purposes, it is the hardest mineral, second only to diamond.
uwaterloo.ca
uwaterloo.ca
corundum
corundum/kəˈrʌndəm; kə`rʌndəm/ n[U]hard crystallized mineral used chiefly in abrasives, or in powder form for polishing 刚玉; 刚石; 金刚砂.
牛津英汉双解词典
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USS Corundum
USS Corundum (IX-164), a designated an unclassified miscellaneous vessel, was the only ship of the United States Navy to be named for corundum. William O.Neill, and named Limestone (IX-158) on 7 February 1944, but renamed and redesignated Corundum (IX-164) on 23 May 1944, prior to acquisition by
wikipedia.org
en.wikipedia.org
Craigmont, Ontario
It was a former mining town that produced corundum from deposits in Mount Robillard, directly north of the community. In 1876, the mountain was discovered as a source for corundum. In 1900, mining operations began by the Canada Corundum Company.
wikipedia.org
en.wikipedia.org
corindon
corindon Min. (kəʊˈrɪndɒn) [F. corindon, corundum.] An early name of Corundum or Adamantine Spar; by some mineralogists used as a name of the species: see corundum 2.1802 W. Nicholson Jrnl. I. 151 Corindon or Adamantine Spar from Philadelphia. 1829 Nat. Philos. I. Gloss. (Useful Knowl. Soc.), Corund...
Oxford English Dictionary
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