coloradoite
/ˌkɒləˈrɑːdəʊʌɪt/Mineralogy
noun
A rare mineral consisting of mercury telluride, having a greyish-black colour and metallic lustre and typically occurring as granular masses in association with metallic gold or silver.
- Chemical formula: HgTe. Crystal system: cubic..
Origin
Late 19th century; earliest use found in Proceedings of the American Philosophical Society. From the name of Colorado + -ite.