interesting i have a few stones from what i believe to be the same source. the state stone i havent done that much with but the mystery white stones he sells works wonders i have never got it to slury with the slury stone but with my dmt it will .mostly i use linde A lapidary powder to make my slury and it puts a very high polish to my edge.i dont know what kind of stone this is looks like marble to me but its harder than any marble i have been in contact with, softer than a arkansas.