One of the mysteries of the English language finally explained.
A mineral which consists of a hydrated sulphate of iron and copper, (Fe,Cu)SO₄.7H₂O, and is a cuprian variety of melanterite occurring as bluish crystals.
Mid 19th century; earliest use found in American Journal of Science. From German Pisanit from the name of F. Pisani, who described the mineral + -it.
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