A custom-cut frequency crystal whose refractive qualities are specifically suited to boosting yield when mining Coherent Ores such as Hedbergite, Hemorphite, Jaspet, Kernite, Omber, Ytirium, Griemeer and Nocxite. Due to their molecular make-up and the strength of the modulated miner's beam, these crystals will deteriorate through extended use. Can be loaded into modulated mining lasers only. Type C crystals are used with modulated mining equipment and provide low yields, with very high residues and very low reliability. Typically used for asteroid field clearance purposes only.