Formula	Name	Family	Number min-max	Isotope mole fraction	State	Relevance
	$Na$	Sodium	element	0.5 - 2		constituent element	main
	$Ca$	Calcium	element	0 - 0.5		constituent element	main
	$K$	Potassium	element	0 - 1		constituent element	main
	$Sr$	Strontium	element	0 - 0.5		constituent element	main
	$Al$	Aluminium	element	2		constituent element	main
	$Si$	Silicon	element	4		constituent element	main
	$O$	Oxygen	element	18		constituent element	main
	$H$	Hydrogen	element	8		constituent element	main

Composition comments

Na must be the dominant species between Ca and K. Sr and Mg are occasionally. Other impurity: Fe

Oxides

Formula	$Na_{2}O$	$K_{2}O$	$SrO$	$CaO$	$MgO$	$Al_{2}O_{3}$	$SiO_{2}$	$H_{2}O$
Mass fraction (%)

Strunz

Class

silicates (09)

Division

tektosilicate with zeolitic H2O (09.G)

Family

Chains of 6-membered rings – tabular zeolites (09.GD)

Code

09.GD.10

Dana

Major class

silicates (VIII)

Class

tectosilicate zeolite group (77)

Type

true zeolites (77.01)

Group

Chabazite and related species (77.01.02)

Code

77.01.02.01a

Phase type

crystalline

Crystal system

trigonal

Crystal class

ditrigonal-scalenohedral

Crystal class symbol

-3m (D3d)

Crystal spacegroup

R-3m

Refringence type

biaxial

Refringence sign

positive or negative

Birefringence

0.0020-0.0050

Refraction index $n_{\alpha}$

1.478-1.485

Refraction index $n_{\beta}$

1.48-1.4895

Refraction index $n_{\gamma}$

1.48-1.49

Pure color

colorless

Color

Colorless, White, Yellowish, Pinkish, Reddish white.

Diaphaneity

transparent to translucent

Luster

vitreous

Links

• Wikipedia
• Webmineral database
• Mindat