Gneiss is often the first major league ore that up and coming miners graduate to. Finding the more expensive variation of Gneiss, called 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. Available primarily in low security status and wormhole systems.