Constituent Churchite YPO4 | SSHADE

Constituent

Name: Churchite YPO4
IMA name: Churchite-(Y)

Class: non-silicate mineral
Compound type: phosphate

Constituent abundance in material

Relevance: main - major
Arrangement: single phase
Mass fraction: 1.0

Chemical composition

Formula: $YPO_4 \bullet 2(H_2O)$
Chemical formula: YPO4•2(H2O)
Elemental formula: (Y3+) P O3 (O-)3 H4
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Y^{3+}$	Yttrium cation	element	1		constituent cation	main
	$(PO_4)^{3-}$	Phosphate anion	chemical function	1		anionic radical	main
	$H_2O$	Water	molecule	2		hydration	main

Chemical functions and bonds

Chemical functions

	Function	Number	Relevance
	$(PO_4)^{3-}$	1
	$R-OH$	2	main

Chemical bonds

	Bond	Number	Relevance
	$\cdot (\cdot) Y^{3+} \cdot O^{-}-$	3
	$-O \dots H-$	4
	$-O-H$	2	main
	$\dddot - \dddot - \dddot - P \dddot - O^{-3/4}$	4

Oxides composition

Oxides

Formula	$Y_{2}O_{3}$	$P_{2}O_{5}$	$H_{2}O$
Mass fraction (%)	51.34	32.27	16.38

Classifications

Strunz

Class: phosphates - arsenates - vanadates (08)
Division: phosphates without additional anions, with H2O (08.C)
Family: with only large cations (08.CJ)
Code: 08.CJ.50

Dana

Major class: phosphates, arsenates, vanadates (VII)
Class: hydrated phosphates (40)
Type: where A+++ XO4·x(H2O) (40.04)
Group: -Churchite- group (40.04.06)
Code: 40.04.06.01

Phase type: crystalline

Crystallography

Crystal system: monoclinic
Crystal class: prismatic
Crystal class symbol: 2/m (C2h)
Crystal spacegroup: C2/c

Texture: polycrystalline

Physical properties

Molar mass: 219.91 $g/mol$
Density: 3.265 $g/cm^3$

Optical properties

Refringence type: biaxial
Refringence sign: positive
Birefringence: 0.0340
Refraction index $n_{\alpha}$: 1.623
Refraction index $n_{\beta}$: 1.631
Refraction index $n_{\gamma}$: 1.657
Color: colorless, gray, snow white
Diaphaneity: transparent
Luster: vitreous