Apatite (more precisely, Fluorapatite), fluorinated calcium phosphate, formula Ca₅(PO₄)₃F.

Crystal system: Hexagonal
Hardness: 5
Density: 3.2 gms/cm³
Colour: Yellow, grey, blue-green, violet-blue or brown. Also colourless.
Streak: Colourless or white

Apatite is a generic name applied to three types of Apatite; Fluorapatite, Hydroxylapatite ((OH) replacing F) and Chlorapatite (Cl replacing F). A solid solution exists between all three end members. Apatite is a principal Phosphate ore and is widespread.

The largest known deposit of Apatite is Kirovsk in the Kola Peninsula, Russia,

The specimen shown is from Gav Valadare, Minas Gerais, Brazil.