This quest is not available in game.
Report back what you have found to Sentinel Glynda Nal'Shea in Auberdine.
The moonwell water has revealed that embedded inside the crystal are a few small fragments of bone, as well as half of a jawbone. The jawbone appears to be from a humanoid, but it is unclear without breaking open the crystal - a feat that even the strongest of magic would find near impossible.
With the task at hand complete, all that remains is to report back to Sentinel Glynda Nal'Shea in Auberdine.