Constituent
Name
Sodalite
IMA name
Sodalite
Class
silicate mineral
Compound type
tektosilicate
Constituent abundance in material
Relevance
main - major
Arrangement
single phase
Mass fraction
1.0
Chemical composition
Formula
$Na_8Al_6Si_6O_{24}Cl_2$
Chemical formula
Na8Al6Si6O24Cl2
Elemental formula
Na3.902 Al2.921 Si2.832 O12 K0.001 Fe0.003
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Na$ Sodium element 3.902 1.0 constituent element main
$Al$ Aluminium element 2.921 1.0 constituent element replacement
$Si$ Silicon element 2.832 1.0 constituent element main
$O$ Oxygen element 12 1.0 constituent element main
$K$ Potassium element 0.001 1.0 constituent element replacement
$Fe$ Iron element 0.003 1.0 constituent element replacement
Composition comments
all O atoms carries a charge of -1/4
Chemical bonds
  Bond Number
$ >Al-O-$ 24
$\geq Si-O-$ 24
$Na^+ \cdot O^{-}-$ 6
$Na^+ \cdot Cl^-$ 2
Oxides
Formula $Na_{2}O$ $K_{2}O$ $FeO$ $SiO_{2}$ $Al_{2}O_{3}$ $Cl$
Mass fraction (%) 25.41 0.01 0.05 35.75 31.29 7.34
Oxides comments
-1.65 % -O=Cl2

Strunz

Class
silicates (09)
Division
tektosilicate without zeolitic H2O (09.F)
Family
with additional anions (09.FB)
Code
09.FB.10

Dana

Major class
silicates (VIII)
Class
tectosilicate Al-Si framework (76)
Type
Feldspathoids and related species (76.02)
Group
Sodalite group (76.02.03)
Code
76.02.03.01
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
hextetrahedral
Crystal class symbol
-43m (Td)
Crystal spacegroup
P-43n
Molar mass
440.27 $g/mol$
Density
2.29 $g/cm^3$
Refringence type
isotropic
Refringence sign
no
Birefringence
0
Refraction index $n_{\alpha}$
1.483 - 1.484
Color
azure blue, white, pink, gray, green
Diaphaneity
transparent to translucent
Luster
vitreous