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Dolomite

Mineral Data
CaMg(CO3)2
Strunz: 
5.AB.10
Physical Properties
Crystal System: 
Trigonal - Rhombohedral
Streak: 
White
Hardness: 
3.5 - 4.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Tharandite, Dolomit and Dolomita