DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Cuprite octahedral crystal. The mineral cuprite is a pure copper oxide (Cu2O), formed in the oxidation zone of copper deposits. Its crystal system is cubic hexoctahedral. It forms well-developed crystals that are cubic, octahedral or dodecahedral. The one seen here is a modified octahedron. Sometimes such crystals form penetration twins (see C017/9267). Colours may be black, red or green. This specimen, from Onganja in Namibia, is 7 centimetres tall.
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