Sellaite

halide

magnesite

Formula: MgF2 normal halide
Specific gravity: 3.15
Hardness: 5
Streak: White
Colour: Colourless, white; colourless in transmitted light.
Solubility: Slightly soluble in water. Decomposed by concentrated sulphuric acid.
Environments

Sedimentary environments

Localities

Brazil

At a magnesite mine in Brumado, Bahia, sellaite occurs in vugs associated with magnesite and quartz.

France

At Moutiers, Savoie, sellaite occurs in bituminous dolomite-anhydrite rock in a glacial moraine.

Italy

At Carrara, Tuscany, it occurs in cavities in marble.

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