I'm trying to find out the same information. I want to use the shark steam mop on my travertine floors in the kitchen, the shower and bathroom. Were you able to find any information on whether or not the steam mop is safe for travertine? I am worried it will take off the sealer that was put on the travertine and then the travertine will be more susceptible to staining, scratching, etc.

I wouldn't do it. Travertine has tiny pits filled with cementious fill. The steam can remove the fill causing mold to grow from the moisture. I've heard travertine is not good in a steam shower for the same reason.