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ATHENA

MINERALOGY

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Mineral: FRANCISCANITE
Formula: Mn2+3V5+(SiO4)(O,OH)7
Crystal System: Hexagonal
Group: Welinite group
IMA Number: 1985-038
References: AM 71 (1986), 1522; HB2/1 (1995)
Type Locality: Pennsylvania mine, San Antonio Valley, Santa Clara Co., California, USA

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