ceruleite
noun
ce·ru·le·ite
sə̇ˈrülēˌīt
plural -s
: 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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Merriam-Webster unabridged
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