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Quartz : SiO2

Copyright © Rock Currier
 
 
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Quartz : SiO2

Copyright © Rock Currier  - This image is copyrighted. Unauthorized reproduction prohibited.

Quartz var. amethyst. Specimen is from the collection of the British Museum of Natural History #91951 (1975). Scale at bottom of image is an inch with a rule at one cm.

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Photo added: 27th May 2010