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Metavivianite
Type Locality
Big Chief Mine (Johnson pegmatite), Glendale, Keystone District, Pennington Co., South Dakota, USA
Mineral Data
Fe
2+
Fe
3+
2
(PO
4
)
2
(OH)
2
·6H
2
O
Strunz:
8.DC.25
Physical Properties
Hardness:
1.5 - 2.0
Tenacity:
sectile
