Khorium Vein
This object can be found in Nagrand (7), Zangarmarsh (6), Isle of Quel'Danas (6), Netherstorm (5), Blade's Edge Mountains (4), Shadowmoon Valley (4), Terokkar Forest (3), Auchindoun: Sethekk Halls (1), Coilfang: The Underbog (1) and Hellfire Peninsula (1).