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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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www.galleries.com/minerals/oxides/corundum/corundum.htm
www.galleries.com/minerals/oxides/corundum/corundum.htm
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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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www.galleries.com/minerals/gemstone/ruby/ruby.htm
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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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www.minerals.net/mineral/oxides/corundum/corundum.htm
www.minerals.net/mineral/oxides/corundum/corundum.htm
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The uses and properties of the mineral Corundum with photos by Geology.com ... Hardness and Use as an Abrasive Emery Red Corundum: Ruby Blue Corundum: Sapphire Mining Rubies and Sapphires Corundum Occurrence Synthetic Corundums...
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geology.com/minerals/corundum.shtml
geology.com/minerals/corundum.shtml
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General Corundum Information ... Corundum Image ... Corundum Crystallography...
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webmineral.com/data/Corundum.shtml
webmineral.com/data/Corundum.shtml
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Show Corundum Photos (245) ... Classification of Corundum ... Occurrences of Corundum...
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www.mindat.org/min-1136.html
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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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www.tradeshop.com/gems/corundum.html
www.tradeshop.com/gems/corundum.html
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Read about corundum, corundum mineral, natural corundum, corundum mineral uses, corundum information, corundum properties, corundum suppliers, corundum exporters, corundum producers, corundum resources, al2o3, corundum applications, synthetic corundum, corundum uses, corundum deep red, corundum powder. ... Finely ground corundum,
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www.mineralszone.com/minerals/corundum.html
www.mineralszone.com/minerals/corundum.html
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