IMHO these are way too rare or broken ATM. I've spent a fair amount of time in game and have seen three drop since the expansion started and all of those were within the first month of the expansion going live, while named were spawning every cycle. Since then I've completed hunter & scavenger & TS earring up to the point where I could put in two type 18 augs and a type 19 aug ... and no aug mats. If anyone has some tips for 'farming' and/or seen them drop I would love to know which zone. I normally cycle Kael and GD missions then go farm kael arena area. Normally get 4-5 named a night. Zero Cyrstallized Precious Velium Ore.