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Tricalcium phosphate is a calcium salt of phosphoric acid with the chemical formula Ca32. It is also known as tribasic calcium phosphate and bone phosphate of lime. It is a white solid of low solubility. Most commercial samples of "tricalcium phosphate" are in fact hydroxyapatite.

It exists as three crystalline polymorphs α, α', and β. The α and α' states are stable at high temperatures.

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