A red crystal

A red crystal is what is formed in Ancient Lava Furnace after a lump of crystal, a chunk of crystal, and a hunk of crystal have been used on it. It is used on "Eye of the Dragon", a rock scenery that resembles a dragon eye on the minimap to produce glowing crystal.

Messages
Selecting the ' inspect ' option:
 * As the crystal touches your hands a voice inside of your head says..
 * Voice in head: Bring life to the dragons eye.