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Schwertmannite

Type Locality
Pyhäsalmi Mine, Pyhäjärvi, Northern Finland Region, Finland
Mineral Data
Fe3+16(OH,SO4)12-13O16·10-12H2O
Strunz: 
7.DE.15
Physical Properties
Crystal System: 
Tetragonal
Streak: 
yellow
Hardness: 
1.0 - 2.0