The color of Emerald Green is said to range from a pale, but vivid, blue green when very finely ground, to a deeper true green when coarsely ground. The molecule's vividness comes from hydrogen bonds. Similar natural compounds are the minerals Chalcophyllite Cu18Al2(AsO4)3(SO4)3(OH)27·36(H2O), Conichalcite CaCu(AsO4)(OH), Cornubite Cu5(AsO4)2(OH)4·(H2O), Cornwallite Cu5(AsO4)2(OH)4·(H2O), and Liroconite Cu2Al(AsO4)(OH)4·4(H2O). These vivid minerals range from greenish blue to slightly yellowish green.
When is a color just a color ?
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