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

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