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Quartz (Var: Amethyst) : SiO2

Copyright © Yves Masson
 
 
 
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Quartz (Var: Amethyst) : SiO2

Copyright © Yves Masson  - This image is copyrighted. Unauthorized reproduction prohibited.

Diameter 12cm
This photo presents the top part of a conical geode which was vertically prisonered in basalt.The bottom part of the geode is quite round and contains small crystals of amethyst regularly spread.
In report with the geometrical position in the basalt where it had been discovered, the top geode superposed square shapes of the photo are very enigmatic.

This Photo was Mindat.org Photo of the Day - 10th Jun 2011

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Photo added: 9th May 2011

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