sodalite

[ sohd-l-ahyt ]

Phonetic (Standard)IPA

noun

a mineral, sodium aluminum silicate, Na 4 Al 3 Si 3 O 1 2 Cl, occurring massive and in crystals, usually blue in color and found in certain alkali-rich igneous rocks.

sodalite

/ ˈsəʊdəˌlaɪt /

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

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First recorded in 1800–10; soda + -lite

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C19: from soda + -lite

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Fragments of a sodalite-syenite have also been found at Soca in the same neighbourhood.

Section of sodalite crystal from the lava of 1794, with belonites and crystals of magnetite enclosed.

Many of them also contain nepheline, sodalite, hauyne and nosean; the much rarer mineral melilite appears also in some examples.

Sodalite or hauyne may also be present, but nepheline is typically absent.

These last consist of an intermixture of nepheline or sodalite and alkali-felspar.

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