Definition of melanochalcite in US English:

melanochalcite

noun

Mineralogy
  • An amorphous pitch-black substance now regarded as a mixture of tenorite, chrysocolla, and malachite.

Origin

Early 20th century. From melano- + ancient Greek χαλκός copper + -ite.

Pronunciation

melanochalcite

/ˌmɛlənə(ʊ)ˈkalsʌɪt/