Good luck in farming this one. It's drop chance, depending on the location is about 1 in 150 or so.

6g is a nice bonus for those of us farming, say, motes of water to use. If you were planning on farming it, your time would be better spent farming netherweave cloth, which a stack sells for about the same, and is FAR more plentiful.

Just another opinion,

Garimon
Horde Spriest
Gilneas