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Dolomite

Dolomite – CaMg(CO₃)₂

Elements: Calcium, Magnesium, Carbon, Oxygen

Class: Carbonates

Crystal System: Hexagonal

Hardness: 3.5-4

Fluorite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Origin: Brumado, Bahia – Brazil