Apatite
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Apatite is a group of phosphate minerals, usually hydroxyapatite, fluorapatite and chlorapatite, with high concentrations of OH⁻, F⁻ and Cl⁻ ion, respectively, in the crystal. Wikipedia
Crystal system: Hexagonal
Birefringence: 0.002–0.008
Cleavage: indistinct,, indistinct
Color: Transparent to translucent, usually green, less often colorless, yellow, blue to violet, pink, brown.
Crystal habit: Tabular, prismatic crystals, massive, compact or granular
Fracture: Conchoidal to uneven
Luster: Vitreous to subresinous