Fluorite

Formula:CaF2
As a Commodity:Fluorite (Fluorspar)
Colour: Purple, lilac, golden-yellow, green, colourless, blue, pink, champagne, brown.
Lustre: Vitreous, Dull
Hardness: 4
Specific Gravity: 3.175 – 3.56
Crystal System: Isometric
Member of: Fluorite Group