\Elv"an\, a.
1. Pertaining to elves; elvish.
2. (Mining) Of or pertaining to certain veins of feldspathic
   or porphyritic rock crossing metalliferous veins in the
   mining districts of Cornwall; as, an elvan course.

\Elv"an\, Elvanite \Elv"an*ite\, n.
The rock of an elvan vein, or the elvan vein itself; an elvan
course.