Owl - coll. P.P. ATHENA

MINERALOGY
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Mineral:ROBERTSITE
Formula:Ca6Mn3+9(PO4)9O6(H2O)6 · 3H2O
Crystal System:Monoclinic
Strunz Nr:7/D.30-50
Group:Arseniosiderite Group
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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