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lazurite

[laz-uh-rahyt, lazh-uh-] /ˈlæz əˌraɪt, ˈlæʒ ə-/
noun
1.
a mineral, sodium aluminum silicate and sulfide, Na 5 Al 3 Si 3 O 12 S 3 , occurring in deep-blue crystals, used for ornamental purposes.
Origin
1890-1895
1890-95; < Medieval Latin lāzur azure + -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lazurite

lazurite

/ˈlæzjʊˌraɪt/
noun
1.
a rare blue mineral consisting of a sodium–calcium–aluminium silicate and sulphide: used as the gemstone lapis lazuli. Formula: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
Word Origin
C19: from Medieval Latin lāzurlapis lazuli
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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