covellite
Co*vel"line (k-vl"ln), Co*vel"lite (-lt), n. Etym: [After Covelli, the discoverer.] (Min.) Defn: A native sulphide of copper, occuring in masses of a dark blue color; -- hence called indigo copper.
Co*vel"line (k-vl"ln), Co*vel"lite (-lt), n. Etym: [After Covelli, the discoverer.] (Min.) Defn: A native sulphide of copper, occuring in masses of a dark blue color; -- hence called indigo copper.