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