What is a blackish lead-gray mineral, closely related to tetrahedrite. It is essentially a sulphide of arsenic and copper called?
tennantite — A blackish lead-gray mineral, closely related to tetrahedrite. It is essentially a sulphide of arsenic and copper. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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