What to mine?
Prismatic Gneiss is a type of ore variant. Gneiss is the base ore, Iridescent Gneiss yields 5% more minerals when refined. Prismatic Gneiss yields 10% more minerals when refined, thus the +5% and +10% ores are more valuable than the base ore types. In highsec, ore variants spawn in belts along with the base ores but in lesser quantities.