Siliceous formations

Siliceous formations

E425/0857

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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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Model release not required. Property release not required.

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