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 was compressed using an older process that compressed batches of raw materials into units using a set input quantity. Newer compression technology uses a more flexible one-to-one unit compression system.