I don't recall which veins can have topaz or crystals. Have you checked all the merchants? If you have not done so since you last leveled up, you could save before getting near or running the crosshairs over them, and reload to see of you can find what you are looking for. I don't recall which can carry gems / minerals (other than Lamotte).
Do you have any Tiger's Eye? The Static Charge Aura (if you have a formula or piece of equipment you can unenchant to get it) is better than the damage auras IMO, since it is triggered by weapons or magic.