PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Dioptase crystals. Dioptase (copper cyclosilicate, green) occurs in the oxidation zones of copper deposits and in the cavities of massive copper minerals. It is very popular with collectors and is often used for jewellery. This sample, found in Namibia, is 10 centimetres long.
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