PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Barite crystals. Barite, or barium sulphate, is a very common mineral. It is used in the oil, paper and rubber industries and is the principal ore for barium. Barium meals and enemas are used in radiography. This sample, from Morocco, is 13 centimetres long.
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