It is VERY different from turning Tru-Stone. The stone I'm using is harder than knife steel! One if the tests I use to determine hardness is a scratch test. First I use a penny, which usually leaves a streak of copper on the stone. Then I go to my pocket knife, which quite often leaves some metal on the stone!Good stuff! I've noticed your other work and am really impressed. I'm sure it's a LOT different than turning other "stone" (aka Tru-Stone, etc). Care to share your methods? Suspect it's not on a wood lathe.