Missing

Missing is an Ultra Rare Ore that can be found anywhere at a 1 in 600 Million (0.0000001667% or 1.666666666666667e-7) chance. Due to Missing's rarity of 600 Million, it is a global ore, which means that its audio will be heard by every player when one is in the mine, whether or not it is placed or found.

This ore's quote implies that the mining operations of Malachite Miners 1 and The Celestial Caverns acknowledge each other's existence, which could mean that both of them exist on the same planet.