Dolomite
Mountain type
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Dolomite is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally CaMg(CO₃)₂. The term is also used for a sedimentary carbonate rock composed mostly of the mineral dolomite. An alternative name sometimes used for the... Wikipedia
Density: 2.84 g/cm³ (Average)
Mohs hardness: 3.5–4.0
Birefringence: δ = 0.179–0.181
Category: Carbonate minerals
Cleavage: 3 directions of cleavage not at right angles
Color: White, grey to pink, reddish-white, brownish-white; colourless in transmitted light
Crystal class: Rhombohedral (3); H–M symbol: (3)