Hypertext Webster Gateway: "tetrahedrite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Tetrahedrite \Tet`ra*he"drite\, n. [So called because the
crystals of the species are commonly tetrahedrons.] (Min.)
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}.
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