Nyxtsium

Overview
Nyxtsium is the seventh rarest ore in the game. It is found almost exclusively below Hellstone, although it does also have about a 1 in 20 million chance of spawning in Obsidian. It is very expensive, worth $80 billion. The ore is named after NyxtsGaming, one of the game's developers.

Physical description
Nyxtsium appears as a blue, neon, sparkling, flaming block. In Studio, it has material "Neon" and color "Really blue."

Badge description
The badge description reads: "Super rare, looks nice, and also very expensive. Good luck finding this," referencing the fact that the ore looks nice, is very rare, and is very expensive.