also: ふっかカルシウム
noun
calcium fluoride (CaF2)
Inorganic compound used in optics, metallurgy, and as a source of fluorine. Technical term.
フッ化カルシウムは光学レンズの材料として使われる。
Calcium fluoride is used as a material for optical lenses.
Compound of フッ化 (fukka, 'fluoridation') from 弗化, and カルシウム (karushiumu, 'calcium'), a loanword from English or German.