this is the blurb:
Stone worktops – stone-hard surface

If you choose a stone worktop you’ll get a work surface that’s extremely durable, scratch resistant and able to withstand high temperatures. The top layer of the worktop is a moulded composite stone powder. This makes the surface, unlike a solid stone worktop, non-porous, smooth and easy to keep clean. It’s also stain resistant, and doesn’t require any impregnation. And the surface always looks the same, which is good to know if you want several worktops in your kitchen.
http://www.ikea.com/ms/en_AU/complet..._surfaces.html