Lapis lazuli : An albuminous mineral of a rich blue color. Same as Lazuli, which see.

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Taxonomy
lapis lazuli, lapis, stone, Afghanistan, mineral, sapphire, free encyclopedia, constituent, lapis jewelry, carving, azure, variations, semi-precious stone, polished Lapis lazuli, rock, lazurite, intense blue, ornaments.

Defination from the web:
lapis lazuli is lazurite (25% to 40%), a feldspathoid silicate mineral composed of sodium, aluminium, silicon, oxygen, sulfur, and chloride. ... Lapis is the Latin for 'stone' and lazuli the genitive form of the Medieval Latin lazulum, which is from the Arabic ...