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Similar natural compounds are the minerals chalcophyllite (Cu18Al2(AsO4)3(SO4)3(OH)27·36H2O), conichalcite (CaCu(AsO4)(OH)), cornubite (Cu5(AsO4)2(OH)4·H2O), cornwallite (Cu5(AsO4)2(OH)4·H2O), and liroconite (Cu2Al(AsO4)(OH)4·4H2O). These minerals range in color from greenish blue to slightly yellowish green.[citation needed]