Constituent Glauberite | SSHADE

Constituent

Name: Glauberite
IMA name: Glauberite

Class: non-silicate mineral
Compound type: sulfate

Constituent abundance in material

Relevance: main - major
Arrangement: in multi-phases
Mass fraction: 0.1 $\pm$ 0.1

Chemical composition

Formula: $Na_2Ca(SO_4)_2$
Chemical formula: Na2Ca(SO4)2
Elemental formula: (Na+)2 (Ca2+) S2 O4 (O-)4
Isotope mixture type: terrestrial abundance

	Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Na^+$	Sodium cation	element	2		constituent cation	main
	$Ca^{2+}$	Calcium cation	element	1		constituent cation	main
	$(SO_4)^{2-}$	Sulfate anion	chemical function	2		anionic radical	main

Chemical functions and bonds

Chemical functions

	Function	Number
	$(SO_4)^{2-}$	2

Chemical bonds

	Bond	Number
	$\dddot - \dddot - \dddot - S \dddot - O^{-1/2}$	4

Oxides composition

Oxides

Formula	$Na_{2}O$	$CaO$	$SO_{3}$
Mass fraction (%)	22.28	20.16	57.56

Classifications

Strunz

Class: sulfates - chromates - molybdates - tungstates (07)
Division: sulfates (selenates, etc.) without additional anions, without H2O (07.A)
Family: with only large cations (07.AD)
Code: 07.AD.25

Dana

Major class: sulfates, chromates, selenates (VI)
Class: anhydrous acid and sulfates (28)
Type: with miscellaneous formulae (28.04)
Group: -Glauberite- group (28.04.02)
Code: 28.04.02.01

Phase type: crystalline

Crystallography

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

Physical properties

Molar mass: 278.18 $g/mol$
Density: 2.7 - 2.85 $g/cm^3$

Optical properties

Refringence type: biaxial
Refringence sign: negative
Birefringence: 0.021 - 0.022
Refraction index $n_{\alpha}$: 1.507 - 1.515
Refraction index $n_{\beta}$: 1.527 - 1.535
Refraction index $n_{\gamma}$: 1.529 - 1.536
Dispersion V: strong, r > v
Color: colorless, gray, gray white, yellow, yellowish white
Diaphaneity: transparent to translucent
Luster: vitreous