Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:OLMSTEADITE
Formula:KFe2+2(Nb,Ta)(PO4)2O2 · 2H2O
Crystal System:Orthorhombic
Strunz Nr:7/D.39-10
References:AM 61 (1976), 5; HB4 (2000)
Type Locality:Hesnard, Custer, Custer Co. and Big Chief, Glendale, Pennington Co., South Dakota, USA

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