Rich Thorium Vein
This object can be found in Winterspring (32), Azshara (34), Silithus (12), Un'Goro Crater (17), Eastern Plaguelands (41), Burning Steppes (107), Western Plaguelands (10), Feralas (2), Searing Gorge (67), Blackrock Depths (4), Molten Core (10) and Dire Maul (2).