Fluorapatite, often with the alternate spelling of
fluoroapatite, is a
phosphate mineral with the formula Ca
5(PO
4)
3F (calcium fluorophosphate). Fluorapatite is a hard crystalline solid. Although samples can have various color (green, brown, blue, violet, or colorless), the pure mineral is colorless as expected for a material lacking
transition metals. Along with
hydroxylapatite, it is an important constituent of
tooth enamel.