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fahlore

Source : Webster's Revised Unabridged Dictionary (1913)

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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