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Wyllieite
Type Locality
Old Mike mine (Great Northern; Old Mike M.S.2212), Custer, Custer District, Custer Co., South Dakota, USA
Mineral Data
(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO
4
)
3
Strunz:
8.AC.15
Physical Properties
Crystal System:
Monoclinic
Hardness:
4.0 - 4.5
Tenacity:
brittle
