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Jahnsite-(CaMnMg)

Type Locality
Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA
Mineral Data
{Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2·8H2O
Strunz: 
8.DH.15
Physical Properties
Streak: 
White
Hardness: 
4.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Jahnsite Ca Mn Mg