Glowstone

Glowstone, only mentioned in an extra page at the end of Chapter 01, is a mineral found in the Abyss.

Description
When certain frequencies are applied to a polished Glowstone, it will produce light. It doesn't produce heat, making it an ideal light source. However, when under pressure, it will explode easily.

Uses
Glowstones are used forDelvers' Headlamps in combination of the gem itself, an iron can, an airtight glass container, a wire, a processed talon crystal, and some water.

Due to easily exploding under pressure, they can also be processed into explosives.