The Collaborative International Dictionary
Melaconite
Melaconite \Me*lac"o*nite\, n. [Gr. me`las black + ? dust.] (Min.) An earthy black oxide of copper, arising from the decomposition of other ores.
Wiktionary
melaconite
n. (context mineralogy English) An earthy black oxide of copper, arising from the decomposition of other ores.