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Manganogrunerite

Type Locality
Dannemora mine, Dannemora, Östhammar, Uppland, Sweden
Mineral Data
☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2
Strunz: 
9.DE.05
Physical Properties
Colour: 
nd
Crystal System: 
Monoclinic
Streak: 
nd
Hardness: 
5.0 - 6.0
Synonyms
Synonyms: 
Dannemorite and Silfbergite
Photos