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Formed from hydrothermal fluids in a shear zone interacting with the rock they passed through, the fossil in the host black shale was transformed. If you look carefully you can also see many small crystals of pyrite, a common inclusion in emeralds from this country. Despite its small size (1.3×1.1×0.9Cm), the preservation is near perfect. This fossil is, as far as I know, unique.

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