Lazuli
Lazuli , noun
[French & New Latin lapis lazuli, Late Latin lazulus, lazurius, lazur from the same Oriental source as English azure. See Azure.]
(Mineralogy) A mineral of a fine azure-blue color, usually in small rounded masses. It is essentially a silicate of alumina, lime, and soda, with some sodium sulphide, is often marked by yellow spots or veins of sulphide of iron, and is much valued for ornamental work. Called also lapis lazuli, and Armenian stone.