LAZ'ULI. Lapis lazuli is a mineral of a fine, azure blue color, usually amorphous, or in rounded masses of a moderate size. It is often marked by yellow spots or veins of sulphuret of iron, and is much valued for ornamental work. It is distinguished from lazulite, by the intenseness of its color.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.