Tricalcium phosphate

Tricalcium phosphate
Names
	IUPAC name Calcium phosphate
	Other names Tribasic calcium phosphate, tricalcium bis(phosphate)
Identifiers
CAS Number	7758-87-4 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:9679 ;
ChemSpider	22864 ;
ECHA InfoCard	100.028.946
EC Number	231-840-8;
PubChem CID	516943;
UNII	K4C08XP666 ;
CompTox Dashboard (EPA)	DTXSID1049803 ;
	InChI InChI=1S/3Ca.2H3O4P/c;;;21-5(2,3)4/h;;;2(H3,1,2,3,4)/q3+2;;/p-6 Key: QORWJWZARLRLPR-UHFFFAOYSA-H ; InChI=1S/3Ca.2H3O4P/c;;;21-5(2,3)4/h;;;2(H3,1,2,3,4)/q3+2;;/p-6 Key: QORWJWZARLRLPR-CYFPFDDLAC; Key: QORWJWZARLRLPR-UHFFFAOYSA-H;
	SMILES [O-]P(=O)([O-])[O-].[O-]P(=O)([O-])[O-].[Ca+2].[Ca+2].[Ca+2];
Properties
Chemical formula	Ca3(PO4)2
Molar mass	310.18 g/mol
Appearance	White amorphous powder
Density	3.14 g/cm3
Melting point	1,670 °C (3,040 °F; 1,940 K)
Solubility in water	1.2 mg/kg
Solubility product (Ksp)	2.07×10−33
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	−4126 kJ/mol (α-form)
Pharmacology
ATC code	A12AA01 (WHO)
Hazards
NFPA 704 (fire diamond)	1 0 0
Flash point	Non-flammable
Related compounds
Other anions	Calcium pyrophosphate
Other cations	Trimagnesium phosphate; Trisodium phosphate; Tripotassium phosphate
Related compounds	Monocalcium phosphate; Dicalcium phosphate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Tricalcium phosphate (sometimes abbreviated TCP), more commonly known as Calcium phosphate, is a calcium salt of phosphoric acid with the chemical formula Ca₃(PO₄)₂. It is also known as tribasic calcium phosphate and bone phosphate of lime (BPL). 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.