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>> No.28981296 [View]
File: 29 KB, 400x266, unique-pyritized-brachiopod_1_7221ee4146805adb270a55ecbbf9013f.jpg [View same] [iqdb] [saucenao] [google]
28981296

>>28981032
no usually its from fluids infiltrating the host rock later on. However you can get pyritized fossils where the fluids replace the original cavity space with mineral like pic related.

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