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57.1 MB (9.0 MB compressed)
5472 x 3648 pixels
46.2 x 31.0 cm ⏐ 18.2 x 12.2 in (300dpi)
DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
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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