chalcophyllite
noun
chal·co·phyl·lite
ˌkalkōˈfiˌlīt
plural -s
: a highly basic arsenate and sulfate of copper and aluminum Cu18Al2(AsO4)3(SO4)3(OH)27.33H2O of various shades of green that occurs in tabular crystals or foliated masses
Word History
Etymology
German chalkophyllit, from chalk- chalc- + phyll- + -it -ite