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Jacobsite

Type Locality
Jakobsberg Mine, Nordmark (Nordmarksberg), Filipstad, Värmland, Sweden
Mineral Data
Mn2+Fe3+2O4
Strunz: 
4.BB.05
Physical Properties
Crystal System: 
Isometric
Hardness: 
5.5 - 6.5
Tenacity: 
brittle
Photos