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Metavivianite

Type Locality
Big Chief Mine (Johnson pegmatite), Glendale, Keystone District, Pennington Co., South Dakota, USA
Mineral Data
Fe2+Fe3+2(PO4)2(OH)2·6H2O
Strunz: 
8.DC.25
Physical Properties
Hardness: 
1.5 - 2.0
Tenacity: 
sectile