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ATHENA

MINERALOGY

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Mineral: JOHNWALKITE
Formula: K(Mn2+,Fe3+,Fe2+)2(Nb,Ta)(PO4)2O2(H2O,OH)2
Crystal System: Orthorhombic
IMA Number: 1985-008
References: NJMM (1986), 115; HB4 (2000)
Type Locality: Champion mine, Keystone, Pennington Co., South Dakota, USA

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