This is an answer from my FB post. I tagged you in it Mike, but I figured I'd post it here so everyone else can see.
Greg is a soapstone expert and runs a soapstone company in San Diego.
Greg Bergmann Not soapstone, they call it Iron Green, it typically is saturated with resin ,which soapstone will do. I first got a few bundles in a container in 06 I think and thought it looked neat but wouldn't react to oil. I cut it and it wasn't just a topical expiry it went all the way thru.
It comes out of Brazil and kind of reminds me of Pietra Cardosa in texture.