Luminite

Luminite is an ore that drops from the Moon Lord Boss, usually in stacks of 70-90 (90-110 in Expert Mode). It can be used to craft Luminite Bars, which can then be used to make many end-game items, such as the Solar, Nebula, Vortex, and Stardust tools and armor.

Crafting all items requires 1088 Luminite. This means defeating the Moon Lord 13 - 16 times in normal mode, or 10 - 13 times in Expert Mode.

Trivia

 * It is the only ore that doesn't need any kind of Furnace or Forge in order to be smelted into bars.
 * Luminite ore can be mined with any pickaxe, including Copper pickaxes.
 * Even though Luminite is an "ore," it won't be affected by spelunker potion or the Magic Lantern and the Suspicious Looking Tentacle.
 * Luminite is not detected by the Metal Detector

History
Luminite 루미나이트 Luminite