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Ankerite

Type Locality
Styrian Erzberg, Eisenerz, Styria, Austria
Mineral Data
Ca(Fe2+,Mg)(CO3)2
Strunz: 
5.AB.10
Physical Properties
Crystal System: 
Trigonal
Streak: 
White
Hardness: 
3.5 - 4.0
Tenacity: 
brittle