Obsidian

Overview
Obsidian is the fifth and, at first glance, final layer players will encounter in Elemental Mines. It is under Granite and is worth $5. It is also rarely seen spawning in the first layer of Bedrock. Mining through the first Bedrock layer through this method reveals Hellstone, a secret layer. This layer is the only source of Adurite in the game.

Physical description
Obsidian appears as a black, shiny block. In Studio, it has material "Ice" and color "Black."

Badge description
The badge description reads: "The final layer. Mine here and thou shalt be rewarded," referencing the fact that Obsidian is seemingly the last layer and that legendary ores spawn here, along with increased amounts of other ores.