Fluorite

Fluorite is a mineral with a hardness of 4 out of 10 on the Mohs scale of mineral hardness [?]. These Cubicly structured gems are made of calcium floride, their full chemical compound being CaF2.

Fluorite is a widely-distributed mineral in the Halide classification, and is now mined in vast quantities. It is a suitable mineral for collectors and is rarely cut as a gem, but massive varieties are carved as ornamental objects.