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ATHENA

MINERALOGY

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Mineral: ROBERTSITE
Formula: Ca6Mn3+9(PO4)9O6(H2O)6.3H2O
Crystal System: Monoclinic
Group: Mitridatite group
IMA Number: 1973-024
References: AM 59 (1974), 48; MM 52 (1988), 505; HB4 (2000)
Type Locality: Tip Top pegmatite, Custer, Custer Co., South Dakota, USA

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