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| − | ====Matrix====
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| − | *'''Osteoid'''
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| − | **Type I collagen forms the backbone of the matrix (90%)
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| − | ***Molecules in staggered rows
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| − | **Non-collagenous protein forming amorphous ground substance (10%)
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| − | ***Mainly glycoproteins and proteoglycans
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| − | *'''Mineral'''
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| − | **Crystalline lattice of calcium phosphate and calcium carbonate
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| − | **Also contains Mg, Mn, Zn, Cu, Na, F
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| − | **Accounts for 65% of bone
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