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Piergorite-(Ce): Ca8Ce2(Al0.5 Fe+++0.5)([ ],Li,Be)2Si6B8O36(OH,F)2
Comments: B&W image of a group of platy-elongated crystals of piergorite-(Ce) on matrix. Location: Tre Croci locality, Vetralla, Viterbo province, Italy. Scale: Crystal Length 400 µm. © American Mineralogist