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Bone ash is a white material produced by the calcination of bones. Typical bone ash consists of about 55.82% calcium oxide, 42.39% phosphorus pentoxide, and 1.79% water. The exact composition of these compounds varies depending upon the type of bones being used, but generally the formula for bone ash is: Ca53. Bone ash usually has a density around 3.10 g/mL and a melting point of 1670 °C. Most bones retain their cellular structure through calcination.
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