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Paragonite

Type Locality
Sponda Alp - Pizzo Forno, Chironico Valley, Leventina, Ticino (Tessin), Switzerland
Mineral Data
NaAl2(AlSi3O10)(OH)2
Strunz: 
9.EC.15
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
2.5