neocyanite
/ˌniːə(ʊ)ˈsʌɪənʌɪt/Mineralogy. Now historical
noun
A copper silicate mineral occurring as blue platy crystals in the fumaroles of Vesuvius; now regarded as identical with litidionite.
Origin
Late 19th century; earliest use found in American Naturalist. From neo- + cyanite, after Italian neociano.