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ceruleite

noun
ce·​ru·​le·​ite | \sə̇ˈrülēˌīt\
plural -s

Definition of ceruleite 

: a mineral CuAl4(AsO4)2(OH)2.4H2O consisting of a hydrous copper aluminum arsenate occurring in turquoise-blue microcrystalline masses (specific gravity 2.80)

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History and Etymology for ceruleite

French céruléite, from cérulé cerulean (from Latin caeruleus) + -ite

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