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Olmsteadite
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| Mineral: | Olmsteadite: KFe++2(Nb,Ta)(PO4)2O2ยท2(H2O) | ||||
| Comments: | Dark brown crystals of olmsteadite with jahnsite on siderite. | ||||
| Location: | Big Chief mine, Keystone, Penningtion County, South Dakota, USA. | ||||
| Scale: | Not Given. | ||||
| Copyright: | © Lou Perloff / Photo Atlas of Minerals | ||||
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