covellite
/koʊˈvɛlaɪt/
noun
- A rare blue or indigo mineral consisting of copper sulfide, often found in copper ore deposits. (Alternative spelling of covelline.)
- The jeweler set a polished piece of covellite in a silver pendant.
- Students in geology class learned to identify covellite by its distinctive color.
- Covellite is sometimes used as a minor ore of copper.