lazurite

A relatively rare blue, violet-blue, or greenish-blue translucent mineral, Na₄₋₅Al₃Si₃O₁₂S, the chief component of lapis lazuli.

The sodium-aluminium silicate which forms the essential part of the ornamental stone lapis lazuli.

A mineral of metamorphosed limestones. Lazurite forms the gemstone lapis lazuli, and crushed lazurite provided the ultramarine color in artists’ paint of the old masters. sodalite and lazurite form the sodalite group of silicate minerals. Chemical composition: Sodium aluminum silicate with sulphur, .