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.  

 If it's smooth enough, sure. Plus, stupidly even heating. Not so much for scrambled eggs, though. Butter is magical.  

 What type(s) of stone? Basalt? 

 I don't know. I'm very uncultured when it comes to rocks. 

 Just get the organic stoneless steel 🫡