Chalcedony mineral

Chalcedony mineral

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Chalcedony mineral. Chalcedony is a variety of the silicate mineral quartz that forms extremely small, fine crystals. It can occur in a variety of colours. This sample, which grew within the void left in a volcanic rock after it solidified, has formed into small pinnacles as a result of hydrothermal processes, or the circulation of hot water. The sample measures 65 millimetres across.

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Keywords: chalcedony, cryptocrystalline, crystal, crystals, earth science, geological, geology, mineral, mineralogy, pinnacles, processes, quartz, rock, stone, volcanic rock, white

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