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Cummingtonite

Mineral Data
☐{Mg2}{Mg5}(Si8O22)(OH)2
Strunz: 
9.DE.05
Physical Properties
Crystal System: 
Monoclinic
Streak: 
nd
Hardness: 
5.0 - 6.0
Synonyms
Synonyms: 
Magnesiocummingtonite