A naturally occurring copper sulfate mineral that forms blue or greenish crystals, historically used in dyeing, medicine, and as a source of copper.
From Greek 'chalkos' (copper) + 'anthos' (flower) + mineralogical '-ite'. Named in the 18th-19th century to formally classify this mineral species.
Chalcanthite is one of the rare minerals that actually dissolves in water—if you leave it sitting around in humid conditions, it literally melts away, which is why true specimens are incredibly rare and valuable!
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