Elvan vs. Elven — What's the Difference?

Elvan is a name used in Cornwall and Devon for the native varieties of quartz-porphyry. They are dispersed irregularly in the Upper Devonian series of rocks and some of them make very fine building stones (e.g.

Relating to or suggestive of an elf.

(mining) Of or relating to certain veins of feldspathic or porphyritic rock crossing metalliferous veins in the mining districts of Cornwall.

Originally, a female elf, a fairy, a nymph; (by extension) any elf.

(uncommon) Elven, elfin, pertaining to elves.

An elm (a tree of the genus Ulmus, particularly the wych elm or Scots elm (Ulmus glabra))).

(mining) The rock of an elvan vein, or the vein itself.

Belonging or relating to, or characteristic of, elves; elfin, elflike.

Pertaining to elves; elvish.

Of or pertaining to certain veins of feldspathic or porphyritic rock crossing metalliferous veins in the mining districts of Cornwall; as, an elvan course.

The rock of an elvan vein, or the elvan vein itself; an elvan course.