lazurite
noun
laz·u·rite
-ˌrīt
plural -s
: a mineral (Na,Ca)8(Al,Si)12O24(S,SO4) occurring as the chief constituent of lapis lazuli, isomorphous with sodalite, and composed of a sodium silicate containing sulfur
Word History
Etymology
German lasurit, from Medieval Latin lazur lapis lazuli (from Arabic lāzaward) + German -it -ite