Constituent Calcium phosphate | SSHADE

Constituent

Name: Calcium phosphate
IMA name: Apatite

Class: non-silicate mineral
Compound type: phosphate
Comments: Apatite is one of the possible form of calcium phosphate
There are 3 endmembers: Apatite-(CaF) [ $Ca_5(PO_4)_3F$ ], Apatite-(CaCl) [ $Ca_5(PO_4)_3Cl$ ] and Apatite-(CaOH) [ $Ca_5(PO_4)_3(OH)$ ]

Constituent abundance in material

Relevance: main - minor
Arrangement: heterogeneous in multi-phases

Chemical composition

Formula: $(Ca_5)(PO_4)_3(OH,F,Cl)$
Chemical formula: Ca5(PO4)3(OH,F,Cl)
Elemental formula: Ca5 P3 O3 (O-)9-10 (H)0-1 (F)0-1 (Cl)0-1
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Ca$	Calcium	element	5		constituent element	main
	$(PO_4)^{3-}$	Phosphate anion	chemical function	3		anionic radical	main
	$(OH)^-$	Hydroxide anion	chemical function	0 - 1		anionic radical	main
	$F$	Fluorine	element	0 - 1		constituent element	main
	$Cl$	Chlorine	element	0 - 1		constituent element	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$(PO_4)^{3-}$	3

Chemical bonds

	Bond	Number
	$\dddot - \dddot - \dddot - P \dddot - O^{-3/4}$	4

Oxides composition

Oxides

Formula	$CaO$	$P_{2}O_{5}$	$H_{2}O$	$F$	$Cl$
Mass fraction (%)	55.07	34.28	0.59	1.24	2.32

Oxides comments

values for x=y=0.33,

C l_{2} O

$Cl_2O$ =-0.52%,

F_{2} O

$F_2O$ =-0.52%

Classifications

Strunz

Class: phosphates - arsenates - vanadates (08)
Division: phosphates, etc. with additional anions, without H2O (08.B)
Family: with only large cations, (OH, etc.):RO4 = 0.33:1 (08.BN)
Code: 08.BN.05

Dana

Major class: phosphates, arsenates, vanadates (VII)
Class: anhydrous phosphates containing hydroxyl or halogen (41)
Type: where (A)5 (XO4)3 Zq (41.08)
Group: Apatite group (41.08.01)
Code: 41.08.01.00

Phase type: crystalline

Crystallography

Crystal system: hexagonal
Crystal class: dipyramidal
Crystal class symbol: 6/m (C6h)
Crystal spacegroup: P6(3)/m

Physical properties

Molar mass: 502.31 - 520.76 $g/mol$
Density: 3.08 - 3.2 $g/cm^3$

Optical properties

Refringence type: uniaxial
Refringence sign: negative
Birefringence: 0.0025 - 0.0075
Refraction index $n_{\alpha}$: 1.630 - 1.675
Refraction index $n_{\beta}$: 1.6325 - 1.6675
Color: colorless, white, gray, yellow, yellowish green
Diaphaneity: transparent to opaque
Luster: vitreous