which is part of the inorganic matter that makes up the matrix of bone?

The inorganic matter that makes up the matrix of bone is primarily calcium hydroxyapatite. This mineral is a crystalline complex composed mainly of calcium and phosphate ions with the chemical formula Ca10(PO4)6(OH)2. Besides hydroxyapatite, the inorganic matrix also contains other mineral ions such as bicarbonate, citrate, magnesium, potassium, and sodium. This inorganic portion of the bone matrix imparts hardness and rigidity to the bone, allowing it to provide mechanical support and structural strength.