You are seeing Ask web results for Corundum.
 [kə-rŭńdəm]
Dictionary.com · The American Heritage® Dictionary
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Corundum - Wikipedia, the free encyclopedia
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THE MINERAL CORUNDUM ... Corundum is the second hardest natural mineral known to science. The hardest mineral, diamond is still four times harder than corundum. The hardness of corundum can be partially attributed to the strong and short oxygen-aluminum bonds.
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RUBY, the red variety of corundum; ... VARIETY OF: Corundum , Al2O3 . ... Ruby is the red variety of corundum, the second hardest natural mineral known to mankind. The non-red variety of corundum is Sapphire Sapphires are well known among the general public as being blue, but can be nearly any color.
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Information on the mineral corundum ... Corundum is a very hard, tough, and stable mineral. It is the hardest mineral after Diamond, making it the second hardest mineral. It is also unaffected by acids and most environments. Translucent brown Corundum and Emery are the most common forms of Corundum.
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General Corundum Information ... Corundum Image ... Corundum Crystallography...
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Show Corundum Photos (252) ... Classification of Corundum ... Occurrences of Corundum...
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Chemical composition -- Aluminum oxide. ... Color -- almost all colors. Medium to dark red stones are known as ruby; other colors, sapphire. ... Durability -- Hardness 9. After diamond, the next hardest gem material. Tough, but still subject to chipping and abrasion. Stones worn regularly in rings will periodically...
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Hexagonal Corundum (variety ruby) crystals in matrix. ... A single tabular Corundum crystal showing growth hillocks on its pinacoidal face. ... Water worn, small pea-sized grains of Corundum from Montana. These were recovered by a panning/screening process.
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South Kallskaret, Tafjord area. In an anothositic layer, close to a dunite, with an extreme coarse grained corundum, up to 15-20 cm crystals. Associated minerals are margarite and chlorite.
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