Siliceous formations

Siliceous formations

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Siliceous formations. Stalactite-like formations of the mineral silica (silicon dioxide) inside a rock cavity. The elongated columns have formed by the precipitation of silica from water dripping from the roof of this cavity in a rock. This process is also how stalactites and stalagmites form from the mineral calcite (calcium carbonate). Each column is less than a centimetre long. This is a form of cryptocrystalline silica called chalcedony. Silica is more commonly known in its crystalline form of quartz.

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Keywords: chalcedony, column, columns, crystal, crystalline, crystals, earth science, geological, geology, mineral, precipitated, precipitation, rock, rocks, silica, siliceous, silicon dioxide, stalactite, stalactites

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