Big question, WHY? The crystal spire resource outcrops have no 'automime spot' to harvest and are basically the same as the out-of-biome types, just in the same place. Can in 0.7.8 you implement it or is it too OP?
In Pillars Biomes, the Crystals are basically as common as Plumbite and Titanite, if not more common. They also give as much crystals as you would get plumbia from a plumbia outcrop.