Fluorspar

Fluorspar Fluorite, also known under the designation mining fluorspar or fluorite or its chemical name calcium fluoride, is the calcium salt of hydrofluoric acid and a very common mineral in the mineral class of simple halides. Fluorite crystallizes in the cubic crystal system with the chemical composition CaF2 and developed cubic crystals with predominantly würfeliger or octahedral crystalline form, as well as rare penetration twins, but also granular, massive aggregates. Pure fluorite is colorless and transparent, by impurities also gray. He can, however, by foreign admixtures almost all colors, mostly assume in low intensity. Common are green, violet, purple to black and yellow crystals ("Honigspat"), but also blue, red and brown Fluorite be found. Just as often, a zonarer color changes can be observed. The stroke color is always white contrast.