\Laz"u*li\, n.[F. & NL. lapis lazuli, LL. lazulus,
lazurius, lazur from the same Oriental source as E. azure.
See {Azure}.] (Min.)
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}.