covellite

[ koh-vel-ahyt, koh-vuh-lahyt ]
/ koʊˈvɛl aɪt, ˈkoʊ vəˌlaɪt /
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noun

a mineral, copper sulfide, CuS, indigo in color and usually occurring as a massive coating on other copper minerals.

Origin of covellite

1840–50; named after Nicolò Covelli (1790–1829), Italian mineralogist who found it; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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