• A relatively rare blue, violet-blue, or greenish-blue translucent mineral, Na<sub>4−5</sub>Al<sub>3</sub>Si<sub>3</sub>O<sub>12</sub>S, the chief component of lapis lazuli.
  • The sodium-aluminium silicate which forms the essential part of the ornamental stone lapis lazuli.
  • A <xref>mineral</xref> of metamorphosed <xref>limestones</xref>. Lazurite forms the gemstone <xref>lapis lazuli</xref>, and crushed lazurite provided the ultramarine color in artists' paint of the old masters. <xref>sodalite</xref> and lazurite form the sodalite group of silicate minerals. Chemical composition: Sodium aluminum silicate with sulphur, .
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