Mysterious green crystal in the Shrine?

[CosmicGuitars]

Right in front of the Shrine is this very odd crystal cluster that is floating aimlessly in front of the door. I have never seen anything like this before, so I'm kind of at a loss as to what, exactly, it is. It cannot be targeted, and there doesn't seem to be any pattern in it's movements. There's nobody else around, and I can't really find any connection to it and any quest. Does anybody have any idea what this is?

http://i.imgur.com/LvWVBKq.jpg

http://i.imgur.com/rkGLUS4.jpg

[Mawnix]

Right in front of the Shrine is this very odd crystal cluster that is floating aimlessly in front of the door. I have never seen anything like this before, so I'm kind of at a loss as to what, exactly, it is. It cannot be targeted, and there doesn't seem to be any pattern in it's movements. There's nobody else around, and I can't really find any connection to it and any quest. Does anybody have any idea what this is?

http://i.imgur.com/LvWVBKq.jpg

http://i.imgur.com/rkGLUS4.jpg

Me thinks that's one of the crystals from Timeless Isle that changes the local weather.

[Skytip]

I believe it's one of the weather stones from the timeless isle.
Look up "Sunset Stone" on wowhead (I can't post links).

[George Costanza]

Weather stone sort of.

[CosmicGuitars]

Looks like it is a Sunset Stone, as a few people have pointed out. How strange. Didn't even know such a thing existed.

Could we get proper weather and day/night cycles now, Blizzard?

[Frozenbeef]

The burning legion are placing summoning stones all over pandaria and intend to conquer it to use it as a staging area for the upcoming expansion!...or it's a weather stone :P

[Eazy]

I see purple version of it in Iron Forge.