Iridium

Iridium is a rare, end game metal added by IndustrialCraft 2, with GregTech adding more functionality to it. Iridium can only be aquired from UU matter; however, with GregTech Iridium can also be mined from Iridium ore, or centrifuged from Platinum Dust. Iridium ore is very rare with a spawn rate of 1 ore per 5 chunks on average. In-game spawn rates will also be lowered since ores spawn randomly from Y height 1 1 to 99 and attempting to spawn ore above ground results in no ore spawned. In a biome with a Y height of 64, in-game rates average 1 ore every 10 chunks. In a biome with a lower Y height of 32, in-game rates average 1 ore every 20 chunks.