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Faheyite: (Mn,Mg)Fe+++2Be2(PO4)4·6(H2O)
Comments: Cluster of faheyite microcrystals, 0.1 cm across. Location: Roosevelt group (Rough Rider), Custer, Custer District, Custer Co., South Dakota, USA. Scale: Picture Size 15 mm. © Jeff Weissman / Photographic Guide to Mineral Species