An archaic or historical term for copper sulfate, a blue-green crystalline mineral used historically in dyeing, medicine, and metalworking.
From Greek 'chalkos' (copper) + 'anthos' (flower, possibly referring to its crystalline appearance). Used in medieval and Renaissance texts.
Chalcanth was called the 'flower' of copper because of its beautiful blue crystalline structure—ancient metalworkers didn't realize they were using copper sulfate as a byproduct, but it became essential to their craft!
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