I don't have a CF to compare it to. That small block was done on a dtm150, then we went in the house. Then we were playing and ran it on the other bout I made yesterday.... The result is both bouts began to polish.

I can't do a grit comparison til I get this small bout fully flat and polished but it looks very promising... The slurry was also white with initially a green hue, that turned a little pink as the rock got flat.

I'm out of the house now till sunday, but I should be able to get the stone onto some 1200 grit wet and dry then have another polishing sesh on the other bout to see where it goes.