- a mineral, sodium aluminum silicate, Na4Al3Si3O12Cl, occurring massive and in crystals, usually blue in color and found in certain alkali-rich igneous rocks.
Origin of sodalite
Examples from the Web for sodalite
Historical Examples of sodalite
These last consist of an intermixture of nepheline or sodalite and alkali-felspar.
Sodalite or hauyne may also be present, but nepheline is typically absent.
Many of them also contain nepheline, sodalite, hauyne and nosean; the much rarer mineral melilite appears also in some examples.
Section of sodalite crystal from the lava of 1794, with belonites and crystals of magnetite enclosed.Volcanoes: Past and Present
- a blue, grey, yellow, or colourless mineral consisting of sodium aluminium silicate and sodium chloride in cubic crystalline form. It occurs in basic igneous rocks. Formula: Na 4 Al 3 Si 3 O 12 Cl