Magnesite
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Magnesite is a mineral with the chemical formula MgCO
₃. Iron, manganese, cobalt, and nickel may occur as admixtures, but only in small amounts. Wikipedia
Color: Colorless, white, pale yellow, pale brown, faintly pink, lilac-rose
Category: Carbonate mineral
Cleavage: perfect
Crystal class: Hexagonal scalenohedral (3m); H-M symbol: (3 2/m)
Fracture: Conchoidal
Luster: Vitreous
Refractive index: nω=1.508 – 1.510 nε=1.700