I found some 1/2" thick gray soapstone coasters locally and wanted to try them out. After some quick searching I did not find much info on the forums for this material so I wanted to share my results.
Soapstone is famous for being an ideal material to use in fire or a bed for fire, It is also extremely soft and you can carve it with a knife, I have used some really nice looking green soapstone that is like jade in every way until you put a sharp object on it and it is so much weaker.
Sorry to say with these gray soap stones when they get wet the image almost completely vanishes!
Once dried they were clear to see (my original photos are after being wet and dried)