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Callaghanite

Type Locality
Sierra Magnesite Mine (Premier Chemicals Mine; Gabbs Magnesite-Brucite Mine; Basic Refractories Mine; Basic Mine), Gabbs, Gabbs District, Paradise Range, Nye Co., Nevada, USA
Mineral Data
Cu2Mg2(CO3)(OH)6·2H2O
Strunz: 
5.DA.25
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
3.0 - 3.5