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Johnwalkite
Type Locality
Champion Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA
Mineral Data
K(Mn
2+
,Fe
2+
,Fe
3+
)
2
(Nb
5+
,Ta
5+
)(PO
4
)
2
O
2
·2(H
2
O,OH)
Strunz:
8.DJ.05
Physical Properties
Hardness:
4.0
