STEFAN DILLER / SCIENCE PHOTO LIBRARY STEFAN DILLER / SCIENCE PHOTO LIBRARY
Copper oxide crystals. Coloured scanning electron micrograph (SEM) of crystals of copper oxide, naturally found as the mineral cuprite in some red coloured rocks. Artificial formation is usually accomplished at high temperatures or at high oxygen pressure. Magnification: x1111 when printed 10 centimetres high.
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