Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Ca$	Calcium	element	9		constituent element	main
	$Mg$	Magnesium	element	0 - 1		constituent element	main
	$Fe^{2+}$	Iron(II) cation	element	0 - 1		constituent element	main
	$(PO_4)^{3-}$	Phosphate anion	chemical function	6		anionic radical	main
	$P$	Phosphorus	element	1		constituent element	main
	$O$	Oxygen	element	4		constituent element	main
	$H$	Hydrogen	element	1		constituent element	main

Chemical functions

	Function	Number
	$(PO_4)^{3-}$	6

Chemical bonds

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

Oxides

Formula	$CaO$	$MgO$	$FeO$	$P_{2}O_{5}$	$H_{2}O$
Mass fraction (%)	47.1	2.63	3.35	46.37	0.84

Oxides comments

with a typical formula $Ca_9Mg_{0.7}Fe^{2+}_{0.5}(PO_4)_6(PO_3OH)$

Strunz

Class

phosphates - arsenates - vanadates (08)

Division

phosphates, etc. without additional anions, without H2O (08.A)

Family

with medium-sized and large cations (08.AC)

Code

08.AC.45

Dana

Major class

phosphates, arsenates, vanadates (VII)

Class

anhydrous phosphates (38)

Type

(A+ B++)3 (XO4)2 (38.03)

Group

Whitlockite group (38.03.04)

Code

38.03.04.01

Phase type

crystalline

Crystal system

trigonal

Crystal class

ditrigonal-pyramidal

Crystal class symbol

3m (C3v)

Crystal spacegroup

R3c

Refringence type

uniaxial

Refringence sign

positive

Birefringence

0.003

Refraction index $n_o$ (w)

1.626

Refraction index $n_e$ (e)

1.629

Pure color

colorless

Color

colorless, white, gray, gray white, yellowish

Diaphaneity

transparent to translucent

Luster

vitreous

Links

• Wikipedia
• Webmineral
• Mindat