Ruby in zoisite

Ruby in zoisite

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Polished specimen showing rough ruby (purple) enclosed in a matrix of Zoisite (green). Ruby is a reddish purple variety of corundum, a crystalline aluminum oxide mineral Al2O3. It is of high hardness and used as an abrasive in industrial processes. Clear, translucent crystals are much in demand as semi-precious stone in jewelry. The host rock Zoisite is a silicate of calcium and aluminium. This specimen is from Longida, Tanzania, actual width is 27 cm.

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Keywords: abrasive, aluminium, aluminium oxide, aluminum, calcium, corundum, crystal, crystalline, gem, gemstone, geological, geology, high hardness, industrial, industry, matrix, mineral, mineralogy, purple, red, reddish purple, rock, rough, silicate, stone, translucent

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