The Collaborative International Dictionary of English v.0.48:

Panabase \Pan"a*base\, n. [Pan- + base. So called in allusion to
   the number of metals contained in it.] (Min.)
   Same as Tetrahedrite.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]