ATHENA MINERALOGY |
Mineral: | JOHNWALKITE |
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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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