How do you allow blocks to generate in sections like granite or diorite?

I’m unsure whether this topic has already been brought up or resolved.
 

But I’m having an issue with making a new stone type, more specifically how to allow it to form in the over world like granite would. I’ve tried the ore method and don’t think it helps. I’m using the most up-to-date version of MCreator.
 

Apologies if this is a duplicate post, but I’ve done some digging and can’t find an answer.