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Pumpellyite-(Mg)

Type Locality
Keweenaw Co., Michigan, USA
Mineral Data
Ca2MgAl2(Si2O7)(SiO4)(OH)2·H2O
Strunz: 
9.BG.20
Physical Properties
Crystal System: 
Monoclinic
Streak: 
White
Hardness: 
5.5
Synonyms
Synonyms: 
Pumpellyite-Mg, Pumpellyite Mg and Pumpellyite - Mg