Constituent Natural eudialyte Na4(Ca,Ce,Fe,Mn,Y,La,Sr,K)3ZrSi8O22(OH,Cl)2 | SSHADE

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Constituent

Name: Natural eudialyte Na4(Ca,Ce,Fe,Mn,Y,La,Sr,K)3ZrSi8O22(OH,Cl)2
IMA name: Eudialyte

Class: silicate mineral
Compound type: cyclosilicate

Constituent abundance in material

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

Chemical composition

Formula: $Na^4(Ca,Ce)_2(Fe^{2+},Mn)Zr (Si_8O_{22})(OH,Cl)_2$
Chemical formula: Na4(Ca,Ce)2(Fe2+,Mn)ZrSi8O22(OH,Cl)2
Elemental formula: Na4 (Ca)1-2 (Ce)0-1 (Fe2+)0-1 (Mn2+)0-1 Zr Si8 (O)12-13 (H)1-2 (Cl)0-1
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Na$	Sodium	element	4		constituent element	main
	$Ca$	Calcium	element	1 - 2		constituent element	main
	$Ce$	Cerium	element	0 - 1		constituent element	main
	$Fe^{2+}$	Iron(II) cation	element	0 - 1		constituent element	main
	$Mn^{2+}$	Manganese(II) cation	element	0 - 1		constituent element	main
	$Zr$	Zirconium	element	1		constituent element	main
	$Si$	Silicon	element	8		constituent element	main
	$O$	Oxygen	element	12 - 13		constituent element	main
	$H$	Hydrogen	element	1 - 2		constituent element	main
	$Cl$	Chlorine	element	0 - 1		constituent element	main

Composition comments: Common impurities: Y, K, Al, Ti

Chemical functions and bonds

Chemical functions

	Function	Number
	$(SiO_4)^{4-}$
	$(OH)^-$

Chemical bonds

	Bond	Number
	$\geq Si-O^-$	4
	$O^--H$	1

Oxides composition

Oxides

Formula	$Na_{2}O$	$CaO$	$Ce_{2}O_{3}$	$Y_{2}O_{3}$	$ZrO_{2}$	$FeO$	$SiO_{2}$	$H_{2}O$
Mass fraction (%)	12.49	8.48	8.27	1.14	12.42	4.34	48.45	1.36

Oxides comments

From

$Na_4Ca_{1.5}Ce_{0.5}Fe^{2+}_{0.6}Mn^{2+}_{0.3}Y_{0.1}ZrSi_8O_{22}(OH)_{1.5}Cl_{0.5}$

Classifications

Strunz

Class: silicates (09)
Division: cyclosilicate (09.C)
Family: [Si9O27]18- 9-membered rings (09.CO)
Code: 09.CO.10

Dana

Major class: silicates (VIII)
Class: cyclosilicates (64)
Type: Cyclosilicate Rings with Other Anions and Insular Silicate groups with mixed ring types (64.01)
Group: Eudialyte group (64.01.01)
Code: 64.01.01.01

Phase type: crystalline

Crystallography

Crystal system: trigonal
Crystal class: ditrigonal-scalenohedral
Crystal class symbol: -3m (D3d)
Crystal spacegroup: R-3m

Texture: polycrystalline

Physical properties

Molar mass: 992.15 $g/mol$
Density: 2.74 - 3.1 $g/cm^3$

Optical properties

Refringence type: uniaxial
Refringence sign: positive
Birefringence: 0.003-0.004
Refraction index $n_{\alpha}$: 1.606-1.61
Refraction index $n_{\beta}$: 1.61-1.613
Color: Pinkish red, Red, Yellow, Yellowish brown, Violet
Diaphaneity: transparent to translucent
Luster: vitreous