Corundum,aluminum oxide,is a common and widespread mineral that is used as an abrasive because of its great hardness. Colored and transparent corundum is used as a gemstone. The red variety is called ruby; all other colors are termed sapphire. Ruby occurs in fine crystals in many localities. At Longido in Tanzania the ruby crystals are embedded in a dense,bright green chrome-rich variety of the mineral zoisite. This combination is unique to this locality | |
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Crédit: | Science Photo Library / Arem, Joel |
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