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Olmsteadite
Type Locality
Big Chief Mine (Johnson pegmatite), Glendale, Keystone District, Pennington Co., South Dakota, USA
Mineral Data
KFe
2+
2
(Nb
5+
,Ta
5+
)(PO
4
)
2
O
2
·2H
2
O
Strunz:
8.DJ.05
Physical Properties
Hardness:
4.0
