Formula: MgF2 normal halide
Specific gravity: 3.15
Colour: Colourless, white; colourless in transmitted light.
Solubility: Slightly soluble in water. Decomposed by concentrated sulphuric acid.
At a magnesite mine in Brumado, Bahia, sellaite occurs in vugs associated with magnesite and quartz.
At Moutiers, Savoie, sellaite occurs in bituminous dolomite-anhydrite rock in a glacial moraine.
At Carrara, Tuscany, it occurs in cavities in marble.
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