Iridium Ore is a material in IC2 that needs UU-Matter to be crafted.
Iridium Ore is used to craft Iridium Plates, which are used in the creating of Quantum Armor. It serves no other purpose.
EU usage for 1 Iridium Ore = 1,166,662 EU - 7,000,000 EU. 1,166,662 EU is used when 32 Scrap is used for each UU-Matter. For 1 UU-Matter, it takes 166,666 EU - 1,000,000 EU.
An easy way to remember the recipe is to notice that the UU-Matter spells out an "I" shape. The "I" stands for "Iridium".