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ATHENA

MINERALOGY

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Mineral: JANGGUNITE
Formula: Mn4+5-x(Mn2+,Fe3+)1+xO8(OH)6 (x=0,2)
Crystal System: Orthorhombic
IMA Number: 1975-011
References: MM 41 (1977), 519; HB3 (1997)
Type Locality: Janggun mine, Bonghwa, Korea

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