Pyritised brachiopod shell from Aseri phosphorite deposit
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Pyritised brachiopod shell from Aseri phosphorite deposit

by Sophie Graul, Tallinn University of Technology, Tallinn, Estonia and France

Pyritised brachiopod shell (reflected light) from the Rannu Member, Kallavere formation, Tremadocian.

The shells are mineralised in CAF-apatite and enriched in REE.

Sample from the Aseri phosphorite deposit, Ida-Viru Country, Estonia.