Fluorspar Lump:
CAF2%  SiO2%
95      2.2
90      8.9
85     13.5
80     18.5
75     22.5
70      28

Fluorspar Powder:
Caf2%  SiO2%
97      0.9
95      2.2
90      8.9
85     13.5
80     18.5

Fluorite (also called fluorspar) is a halide mineral composed of calcium fluoride, CaF2. It is an isometric mineral with a cubic habit, though octahedral and more complex isometric forms are not uncommon. Crystal twinning is common and adds complexity to the observed crystal habits.