Information card for entry 9000474

Structure parameters

• Mineral name: Olmsteadite
• Formula: Fe2 H4 K Nb0.59 O12 P2 Ta0.41
• Calculated formula: Fe2 H4 K Nb0.59 O12 P2 Ta0.41
• Title of publication: Olmstaedite, K2Fe2[Fe2(Nb,Ta)2O4(H2O)4(PO4)4], a new species, its crystal structure and relation to vauxite and montgomeryite
• Authors of publication: Moore, P. B.; Araki, T.; Kampf, A. R.; Steele, I. M.
• Journal of publication: American Mineralogist
• Year of publication: 1976
• Journal volume: 61
• Pages of publication: 5 - 11
• a: 7.512 Å
• b: 10 Å
• c: 6.492 Å
• α: 90°
• β: 90°
• γ: 90°
• Cell volume: 487.679 ų
• Number of distinct elements: 7
• Space group number: 26
• Hermann-Mauguin space group symbol: P b 21 m
• Hall space group symbol: P -2 -2b
• Has coordinates: Yes
• Has disorder: No
• Has Fobs: No