Bauxite is the new ore introduced in Pixelmon. Its main usage is the manufacturing of the advanced Pixelmon machines. The easiest way to tell Bauxite from Iron, is trying to break it with a Stone Pickaxe. Bauxite can't be broken with it, while Iron can. The color is slightly different as well; it's a little more dull than Iron Ore.
Bauxite ore is used to produce Aluminum Ingots by smelting it in a furnace.