PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Quartz crystals. These transparent crystals are rhombohedral macrocrystals. Quartz is a form of silica (silicon dioxide) and is the second most abundant mineral in the Earth's crust after feldspar. This sample, from France, is 10 centimetres wide.
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