lazurite

lazurite

[laz-uh-rahyt, lazh-uh-]
noun
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:
1890–95; < Medieval Latin lāzur azure + -ite1

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lazurite (ˈlæzjʊˌraɪt)
 
n
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
 
[C19: from Medieval Latin lāzurlapis lazuli]

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