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From Biology-Online Dictionary
(Science: chemical) a mineral of a fine azure-blue colour, 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.
Synonym: lapis lazuli, and Armenian stone.
Origin: f. & NL. Lapis lazuli, LL. Lazulus, lazurius, lazur from the same oriental source as E. Azure. See azure.