DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Dendritic crystals in chalcedony. Chalcedony (white) is a variety of the silicate mineral quartz that forms extremely small, fine crystals. It can occur in a variety of colours. This sample has a delicate dendritic (branching) pattern caused by iron oxide (orange) mineral deposits. The sample measures 27 millimetres tall.
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