It is soapstone. I think some people are too young to know what we are talking about. The cracks have been there forever and leaking so little that a pan underneath has been plenty. Now, it seems to be the seal around the drain - not the one that the washing machine empties into. The plumber said that he won't touch it and wants me to get a new wash tub for $9000. No way. I am also looking for something to seal it with. There must be something. Any answers?