Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A relatively rare blue mineral, (Mg, Fe)Al2(PO4)2(OH)2, with a vitreous luster.

from The Century Dictionary.

  • noun A mineral of a light- or indigo-blue color, crystallizing in the monoclinic system.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) A mineral of a light indigo-blue color, occurring in small masses, or in monoclinic crystals; blue spar. It is a hydrous phosphate of alumina and magnesia.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A semi-precious gemstone that is a basic phosphate of magnesium, iron and aluminium

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Medieval Latin lazulum, lapis lazuli; see lapis lazuli + –ite.]

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