Noun
calcium fluoride (uncountable)
(inorganic chemistry) An inorganic compound and a white insoluble solid, CaF2, occurring as fluorite.
Crystals of calcium sulfate or calcium fluoride are doped with dysprosium. Source: Internet
In the early years of the 21st century, the stepper market for calcium fluoride collapsed, and many large manufacturing facilities have been closed. Source: Internet