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
 * Luminite is the only ore that doesn't have its own designated armor set, instead it is crafted into the solar armor, the stardust armor, the vortex armor, and the nebula armor

History
Luminite 루미나이트 Luminite