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Quartz (Var: Chalcedony) : SiO2

Copyright © Bruce T. Mitchell
 
 
minID: P03-EA0

Quartz (Var: Chalcedony) : SiO2

Copyright © Bruce T. Mitchell  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 5.5 cm x 3.5 cm x 1.5 cm

A pseudomorph of blue-gray chalcedony after calcite. The chalcedony has substituted for a perfect scalenohedral crystal of calcite (upper center) about 2.5 cm long. The chalcedony is partly covered by a druse of quartz microcrystals giving it a sparkling appearance. Overall size of the specimen is 5.5 x 3.5 x 1.5 cm.

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Photo added: 13th Apr 2009