Infernalite Ore

Infernalite Ore is the most valuable ore in the game. However, it only occurs after 1300 feet.

Ore Description
The value of this ore is the most, at $250,000 a piece. If the player has reached the depth required to find this ore, it is extremely valuable for an expensive tool upgrade, such as the Colossal Lantern.

The description of the ore is as follows: "The rarest of all metals, sharp and jagged right out of the ground."