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A so-called "sliced quartz" from the Bor mine, Dalnegorsk, Russia, 12 cm long.  The quartz grew among calcite crystals which accounts for the strange "cuts".  Some of the calcite still remains on this piece. (Author: John S. White)

A so-called "sliced quartz" from the Bor mine, Dalnegorsk, Russia, 12 cm long. The quartz grew among calcite crystals which accounts for the strange "cuts". Some of the calcite still remains on this piece. (Author: John S. White)

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