Heh, I was thinking about electromagnetic waves the other day, and how quartz is used to catch/amplify radio waves.

And I thought 'how final fantasy is that?'

Maybe have a crystal deep within a cave that the illustrious hero finds in the forest one day, and the thing starts to hum and speak to him, because it's being controlled from an underground bunker by evil people in the world.

now, has that been done yet, though