pisanite
/pɪˈzanʌɪt/Mineralogy
noun
A mineral which consists of an hydrated sulphate of iron and copper, (Fe,Cu)SO4.7H2O, and is a cuprian variety of melanterite occurring as bluish crystals.
Origin
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.