Khorium Vein
This object can be found in Shadowmoon Valley (97), Auchindoun: Sethekk Halls (4), Hellfire Peninsula (221), Blade's Edge Mountains (115), Isle of Quel'Danas (4), Nagrand (194), Netherstorm (109), Zangarmarsh (50), Coilfang: The Underbog (1), Terokkar Forest (135), Auchindoun: Shadow Labyrinth (1), Coilfang: The Steamvault (2), Auchindoun: Mana-Tombs (2) and Coilfang: The Slave Pens (3).