Which form of phosphorus is the main inorganic component of bones and teeth?

The main inorganic component of bones and teeth is a form of calcium phosphate known as hydroxylapatite [Ca₅(PO₄)₃OH].123

During the biological process of bone mineralization, these crystals are deposited into the collagen matrix of bone, providing the structure with its necessary strength and rigidity. While this mineral is the primary inorganic constituent, it is rarely pure in nature and often exists in a solid-solution series with fluorapatite, where fluorine substitutes for the hydroxyl group.41