FLUORITE (BLUE & PURPLE) on QUARTZ, Burc Mine - at the Burg Tarn France (small cabinet)

Fluorite, known as fluorspar, is the mineral variant of calcium fluoride, represented by the formula CaF2. This mineral is classified within the halide group and typically forms in an isometric cubic structure, though octahedral and other intricate isometric shapes can also be found. According to the Mohs scale of mineral hardness, fluorite is assigned a hardness value of 4, determined through scratch resistance comparisons.

From a very rare and isolated find in 1998.