DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Cuprite twinned crystals. 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 (see C017/9266) or dodecahedral. The paired, interlocking crystals in this sample are an example of penetration twinning. Colours may be black, red or green. This specimen is 11 centimetres across.
Model release not required. Property release not required.