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(mineralogy) 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.

Rich royal blue, green, yellow, violet, white veining common – Massive; rarely as dodecahedra – Common on {111} forming pseudohexagonal prisms – Poor on {110} – Conchoidal to uneven – Brittle – 5.5–6 – Dull vitreous to greasy – White – Transparent to translucent – 2.27–2.33 – Isotropic – N = 1.483 – 1.487 – Bright red-orange cathodoluminescence and fluorescence under LW and SW UV, with yellowish phosphorescence; may be photochromic in magentas – Easily to a colourless glass; sodium yellow flame – Soluble in hydrochloric acid and nitric acid – Hackmanite; tenebrescent; violet-red or green fading to white.

(mineralogy) 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 sample of sodalite-carbonate pegmatite from Bolivia, with a polished rock surface.

(mineralogy) 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.

Sodalite.