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Prehnite, Gyrolite

Prehnite : Ca2Al2Si3O10(OH)2, Gyrolite : NaCa16Si23AlO60(OH)8·14H2O
minID: 53V-YV8

Photo Copyright © Tony Peterson  - This image is copyrighted. Unauthorized reproduction prohibited.

This specimen, 10 cm tall, was sold to me as okenite on prehnite but it resembles typical gyrolite specimens. There are a few fluorapophyllite crystals on the zeolite balls (see closeup photos). One stereo view in this series. Collection and photo, T. Peterson.

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Photo added: 12th Oct 2008

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