{ Co‐vel″line (k?–v?l″l?n), Co‐vel″lite } (–l?t), n. [After Covelli, the discoverer.] (Min.) A native sulphide of copper, occuring in masses of a dark blue color; — hence called indigo copper.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.