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Griphite

Type Locality
Everly Mine (Riverton lode), Harney City, Pennington Co., South Dakota, USA
Mineral Data
Na4Li2Ca6(Mn2+,Fe2+,Mg)19Al8(PO4)24(F,OH)8
Strunz: 
8.BF.15
Physical Properties
Crystal System: 
Isometric
Hardness: 
5.5
Tenacity: 
brittle