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Dominant species
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Sodalite
Chemical
Formula
Na?Al?Si?O??Cl
Species
Silicates
Crystal
System
Isometric
Mohs
Scale
5-6
Specific
Gravity
2.27-2.33
Color
Rich royal blue, green, yellow, Purple, white veining common
Streak
White
Luster
Vitreous, Greasy
Refractive
Index
n = 1.483 - 1.487
Diaphaneity
Transparent, Translucent
Cleavage
Poor/IndistinctPoor on
Fracture
Irregular/Uneven, Conchoidal
Crystal Habit:Massive; rarely as dodecahedra
Geological Setting:Sodalites occur:
- in alkaline intrusives (Princess Mine, Bancroft, Ontario, Canada);
- in alkaline pegmatites (Mont St Hilaire, Quebec, Canada);
- in carbonatites (Magnet Cove, Arkansas, USA);
- in marble skarns or metasomatized calcareous rocks (Ladjuar Medan, Sar-e-Sang, Afghanistan);
- in phonolites and volcanic ejecta (Mount Vesuvius, Italy).
Sodalite3984
Sodalite3984
Sodalite3982
Sodalite3982
Sodalite3978
Sodalite3978
Sodalite3969
Sodalite3969
Sodalite3967
Sodalite3967
Sodalite3966
Sodalite3966
Sodalite3960
Sodalite3960
Sodalite3955
Sodalite3955
Sodalite3948
Sodalite3948
Sodalite3946
Sodalite3946
Sodalite3944
Sodalite3944
Sodalite3939
Sodalite3939
Sodalite3935
Sodalite3935

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