Mineral phase
IMA name
Sodalite
IMA Code
Sdl
Type
Class
silicate mineral
Compound type
tektosilicate
Chemical composition
Formula
$Na_8Al_6Si_6O_{24}Cl_2$
Chemical formula
Na8Al6Si6O24Cl2
Elemental formula
(Na+)8 Al6 Si6 O24 (Cl-)2
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Isotope mole fraction State Relevance
$Na^+$ Sodium cation element 8 constituent cation main
$Al$ Aluminium element 6 constituent element main
$Si$ Silicon element 6 constituent element main
$O$ Oxygen element 24 constituent element main
$Cl^-$ Chloride anion element 2 constituent anion main
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 $Na_{2}O$ $Al_{2}O_{3}$ $SiO_{2}$ $Cl$
Mass fraction (%) 25.58 31.56 37.2 7.32
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
969.21 $g/mol$
Density
2.29 $g/cm^3$
State NTP
solid
Refringence type
isotropic
Refringence sign
no
Birefringence
0
Refraction index $n_{\alpha}$
1.483 - 1.484
Pure color
colorless
Color
azure blue, white, pink, gray, green
Diaphaneity
transparent to translucent
Luster
vitreous
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