The hardness of bone is primarily due to a combination of co

The hardness of bone is primarily due to a combination of collagen and crystallized salts. The salts include small amounts of sulfate, fluoride, and magnesium hydroxide; medium amounts of calcium carbonate, and large amounts of:

Solution

Bone contains large amounts of hydroxyapatite, which gives strength to the bone and responsible for its hard nature.Its chemical compoistion is Ca₁₀(PO₄)₆(OH)_2. Usuallay bones conatins high amounts of mineral salts of calcium, phosphorous and magnesium.