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Braunite

Type Locality
Oehrenstock (Öhrenstock), Langewiesen, Ilmenau District, Thuringian Forest, Thuringia, Germany
Mineral Data
Mn2+Mn3+6(SiO4)O8
Strunz: 
9.AG.05
Physical Properties
Streak: 
Black
Hardness: 
6.0 - 6.5
Tenacity: 
brittle