TETRAHEDRITE
Etymology
Named for its tetrahedral crystals in 1845.
Noun
tetrahedrite (countable and uncountable, plural tetrahedrites)
(mineral) A complex ore of copper, a mixed sulfide of copper, iron, zinc, silver and antimony.
Source: Wiktionary
Tet`ra*he"drite, n. Etym: [So called because the crystals of the species are commonly tetrahedrons.] (Min.)
Definition: A sulphide of antimony and copper, with small quantities of other metals. It is a very common ore of copper, and some varieties yield a considerable presentage of silver. Called also gray copper ore, fahlore, and panabase.
Source: Webster’s Unabridged Dictionary 1913 Edition
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