Honestly, I might do that once I build my own house. Though, I think eggs will still be easier to cook in a metallic pan...
Nice. The only reason I know about this is because I saw a video of a guy making eggs and sausage on a rock. He melted some butter on it and the eggs didn't stick at all. It was pretty magical.
What type(s) of stone? Basalt?
I don't know. I'm very uncultured when it comes to rocks.