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Petr Hykš
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11 Questions

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Could this be pyroxene twinning ? (thin section)

Dec 6 '16 at 18:32 Petr Hykš 595
 
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I have found this structure in thin section. What is it?

Nov 24 '16 at 1:18 Daniel Griscom 1,048
 
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What exactly is ammonite?

Dec 1 at 20:19 Glorfindel 272