The Collaborative International Dictionary of English v.0.48:

Idrialine \Id"ri*a*line\, Idrialite \Id"ri*a*lite\, n. [Cf. F.
   idrialine.] (Min.)
   A bituminous substance obtained from the mercury mines of
   Idria, where it occurs mixed with cinnabar.
   [1913 Webster]