Use this empty vial and fill up on some moonwell water here in Auberdine.  Such potent magic should provide a clue as to the composition of the crystal.  To do that, you'll pour the liquid over the crystal; it should take care of the rest.$B$BWhile I don't anticipate anything bad happening to you, I still want you to be careful.  Above us to the east is Felwood; if that crystal is tied to that place as I suspect it is, then it could prove to be very dangerous.