Corundum - Wikipedia Corundum is a crystalline form of aluminium oxide (Al2O3) typically containing traces of iron, titanium, vanadium, and chromium [3][4] 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 [7]
Corundum: Use as a Gemstone, Abrasive, Refractory - Geology. com Corundum is a rock-forming mineral that is found in igneous, metamorphic, and sedimentary rocks It is an aluminum oxide with a chemical composition of Al 2 O 3 and a member of the trigonal crystal system
Corundum | Properties, Formation, Uses » Geology Science Corundum is a mineral that is primarily composed of aluminum oxide (Al2O3) and is one of the naturally occurring crystalline forms of aluminum oxide It is a very hard mineral and is commonly used as an abrasive in various industrial applications
Corundum | Aluminum Oxide, Gemstone, Abrasive | Britannica corundum, naturally occurring aluminum oxide mineral (Al 2 O 3) that is, after diamond, the hardest known natural substance Its finer varieties are the gemstones sapphire and ruby (qq v ), and its mixtures with iron oxides and other minerals are called emery (q v )
The Mineral corundum - The Mineral and Gemstone Kingdom Corundum is a very hard, tough, and stable mineral For all practical purposes, 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
Corundum: Mineral information, data and localities. - mindat. org A red, gem variety of corundum The red colour is caused by minor amounts of trivalent Cr replacing Al in the crystal structure In traditional gemmological terms, ruby has to be blood-red and of clear, facetable quality to justify the name
Corundum Gem Guide and Properties Chart - Gemstones. com Corundum is a mineral species best known for its two popular gemstone varieties, sapphire and ruby All colors of corundum except red are known as sapphire The term sapphire, when used without any modifiers, refers to only the blue variety of corundum
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 It is one of the naturally transparent materials, but can have different colors when impurities are present
Corundum - Details and Facts Corundum is a mineral that is commonly found in metamorphic and igneous rocks It is composed of aluminum oxide and can be identified by its hardness and crystal structure Corundum has a hardness of 9 on the Mohs scale, making it one of the hardest minerals known to man
Corundum Factsheet and Corundum Mineral Information - MINERALMINERS. COM Corundum occurs in a variety of geological settings, characteristically in aluminum-rich and silica-poor rocks It often occurs as an accessory mineral in metamorphic rocks derived from aluminous or carbonate sediments such as crystalline limestones and marbles, mica schists and gneisses