Ca5(PO4)3(F,Cl,OH)Hexagonal
Apatite
Ca5(PO4)3(F,Cl,OH)
PhosphatesChemical FormulaCa5(PO4)3(F,Cl,OH)
Crystal SystemHexagonal
Mohs Hardness5
Specific Gravity3.2
ColorGreen, blue, yellow, purple, brown
LusterVitreous to resinous
StreakWhite
CleavagePoor
FractureConchoidal to uneven
Occurrence
Major source of phosphorus. Found in igneous and metamorphic rocks. Tooth enamel is similar.