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Olmsteadite
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| Olmsteadite Formula: (Nb.59 Ta.41) Fe2 K P2 O12 H4 Name: Olmsteadite Unit cell: 7.512 10.0 6.492 90.0 90.0 90.0 , V=487.68 Space group: PB21M (26) |
Moore P B , Araki T , Kampf A R , Steele I M , American Mineralogist , 61 (1976) p.5-11, Olmstaedite, K2Fe2[Fe2(Nb,Ta)2O4(H2O)4(PO4)4], a new species, its crystal, structure and relation to vauxite and montgomeryite
