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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}{Mn
2+
}{(Mg,Fe
2+
)
2
}{Fe
3+
2
}(PO
4
)
4
(OH)
2
·8H
2
O
Strunz:
8.DH.15
Physical Properties
Streak:
White
Hardness:
4.0
Tenacity:
brittle
Synonyms
Synonyms:
Jahnsite Ca Mn Mg
