III-Grade gneiss has a fracturized molecule-structure, which gives it a prismatic appearance. It is the most sought after member of the Gneiss family, as it yields 10% more than common Gneiss. Gneiss is a popular ore type because it holds significant volumes of three heavily used minerals, increasing its utility value. It has quite a bit of Mexallon as well as some Pyerite and Isogen. This material is compressed and a much more compact form of the original material.

Gneiss is often the first major league ore that up and coming miners graduate to. Finding the more II-Grade variation of Gneiss, known as iridescent gneiss, is a major coup for these miners due to its 5% greater mineral yield. Gneiss is a popular ore type because it holds significant volumes of three heavily used minerals, increasing its utility value. It has quite a bit of Mexallon as well as some Pyerite and Isogen. This material is compressed and a much more compact form of the original material.