The matrix is hardened by the binding of inorganic mineral salt, calcium phosphate, in a chemical arrangement known as bone mineral, a form of calcium hydroxylapatite.- Bone
Hydroxyapatite is present in bone and teeth; bone is made primarily of HA crystals interspersed in a collagen matrix—65 to 70% of the mass of bone is HA.- Hydroxyapatite
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Bone mineral (also called inorganic bone phase, bone salt, or bone apatite) is the inorganic component of bone tissue.
Bone mineral is formed predominantly from carbonated hydroxyapatite with lower crystallinity.