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ATHENA

MINERALOGY

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Mineral: GROUTITE
Formula: Mn3+O(OH)
Crystal System: Orthorhombic
Group: Diaspore group
IMA Number: 1945
References: AM 32 (1947), 654; HB3 (1997); L 11 (2019), 7
Type Locality: Mahnomen mine, Cuyuna Range, Crow Wing Co., Minnesota, USA

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