Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:JOHNWALKITE
Formula:K(Mn2+,Fe3+,Fe2+)2(Nb,Ta)(PO4)2O2(H2O,OH)2
Crystal System:Orthorhombic
Strunz Nr:7/D.39-20
References:NJMM (1986), 115; HB4 (2000)
Type Locality:Champion mine, Keystone, Pennington Co., South Dakota, USA

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