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Mineral contains: Piergorite-(Ce)
Boiocchi M, Callegari A, Ottolini L (2006) The crystal structure of piergorite-(Ce), Ca8Ce2(Al0.5Fe3+0.5)Σ1( ,Li,Be)2Si6B8O36(OH,F)2: A new borosilicate from Vetralla, Italy, with a modified hellandite-type chain. American Mineralogist 91, 1170-1177
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