laz·u·rite (lāz'yŏŏ-rīt', lāz'ə-, lāzh'ə-) n. A relatively rare blue, violet-blue, or greenish-blue translucent mineral, Na4-5Al3Si3O12S, the chief component of lapis lazuli.
[Medieval Latin lāzur, lapis lazuli (from Arabic lāzaward; see lapis lazuli) + -ite1.]