block patches

Hi, I'm creating a mod and I'd like to create some random dripstone block patches in the savanna biome but I can't do it. I've already tried creating a structure with the dripstone block and make it spawn in group but when blocks spawn are very far from each other, I'd like something different like real patches of dripstone. I've looked for some forum like this but I haven't find any answer. I hope someone will help me.