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Corundum: Difference between revisions
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'''Corundum''' (from Tamil "kurundam") is a crystalline form of aluminum oxide (Al<sub>2</sub>O<sub>2</sub>) and one of the rock-forming minerals. It is naturally clear, but can have different colors when impurities are present. Transparent specimens are used as gems, called ruby if red, while all other colors are called sapphire. A pinkish-orange sapphire is called padparadscha. | '''Corundum''' (from Tamil "kurundam") is a crystalline form of aluminum oxide (Al<sub>2</sub>O<sub>2</sub>) and one of the rock-forming minerals. It is naturally clear, but can have different colors when impurities are present. Transparent specimens are used as gems, called ruby if red, while all other colors are called sapphire. A pinkish-orange sapphire is called padparadscha. | ||