sodalite

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sodalit
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A mineral of alkaline igneous and plutonic rocks that are low in silica, of the chemical composition of sodium aluminum silicate with chlorine, Na4Al3Si3O12Cl. Pink sodalite is sometimes called hackmanite. Sodalite and lazurite form the sodalite Group of silicate minerals
A mineral of a white to blue or gray color, occuring commonly in dodecahedrons, also massive
a vitreous mineral consisting of sodium aluminum silicate and sodium chloride in crystalline form; occurs in igneous rocks
A mineral of alkaline igneous and plutonic rocks that are low in silica. Pink sodalite is sometimes called hackmanite. Sodalite and lazurite form the sodalite Group of silicate minerals
It is a silicate of alumina and soda with some chlorine