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Robertsite

Type Locality
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA
Mineral Data
Ca3Mn3+4(PO4)3O2·3H2O
Strunz: 
8.DH.30
Physical Properties
Streak: 
Red-brown
Hardness: 
3.5
Tenacity: 
waxy
Photos