On my table saw.
"Cutting rock on a table saw," you may ask, "How is such a thing possible?"
It takes a really effing expensive saw blade. I found one tonight.
I pretty much cut strips from the rock, a couple of inches wide. I'll glue these onto some backer boards, prep them, and pour some silicone molds from them. Then when I finally get to pouring rock, I'll have additional molds of real rock profiles.
The rock is actually pieces that had originally been used to delineate some long-dead flowerbeds. Limestone, really flaky but basically solid.
Some of the pieces split while I was cutting them. I'll use the smaller broken pieces as texture stamps in some clay to create some clay negatives up to the approximate size that I want, then pour some plaster positives from those and make more silicone molds.
"But if cutting wood makes sawdust, doesn't cutting stone make... I don't know, stone dust?"
And it's really fine.
Dust mask under the bandanna and I still got stone dust in my nose. Next time, respirator.