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Prehnite : Ca2Al2Si3O10(OH)2, Calcite : CaCO3

Copyright © Ivan A. Novikov
 
 
minID: 4WK-YT8

Prehnite : Ca2Al2Si3O10(OH)2, Calcite : CaCO3

Copyright © Ivan A. Novikov  - This image is copyrighted. Unauthorized reproduction prohibited.

Not curved, bluish crystals of prehnite with orange calcite. Size of big crystal - 14x12 mm. This prehnite is abnormal hard (> 7 Mohs). Perhaps the abnormal hardness correlated with the correct crystallinity and low defects. Collected in 2012.

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Photo added: 22nd Jun 2012