What is the main inorganic component of bones and teeth?

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The main inorganic component of bone and teeth is calcium phosphate, which exists in the mineral form known as hydroxyapatite crystals that occupy the matrix surrounding collagen fibers. This mineral phase provides the hardness and rigidity essential for skeletal support and tooth durability. The other substances listed are not the primary mineral in bone or dentin: potassium chloride is just an electrolyte salt; calcium chloride is a soluble salt; calcium oxalate is a different mineral not characteristically found as the main bone/dentin constituent.