DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Nickeline. This mineral, also known as niccolite, consists of nickel arsenide. It is formed by hydrothermal modification of ultramafic rocks and associated ore deposits. This sample is from Erzgebirge, Bohemia, Germany, and measures 80 millimetres across.
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