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ATHENA

MINERALOGY

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Mineral: BIRNESSITE
Formula: (Na,Ca,K)0,6(Mn4+,Mn3+)2O4(H2O)1,5
Crystal System: Orthorhombic
IMA Number: 1956
References: MM31 (1956), 283; Australian Min. 6 (1992), 65; HB3 (1997); AM 92 (2007), 771
Type Locality: Birness, Aberdeenshire, Scotland, United Kingdom

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