Originally Posted by
mrcalhou
I once made a fire with a magnesium ribbon and water in my freshman chemistry lab. The magnesium reacts with the water to form Mg(OH)2 and hydrogen gas. The reaction is highly exothermic, meaning that it gives off energy, in the form of heat. The heat that it created was so hot that it ignited the hydrogen gas. It was hella awesome. At the time I didn't know what the crap I did.
I know sodium metal has to be stored in mineral oil or similiar because it's reactive with water and will react with the water in the atmosphere.
Still more than just stone, but I thought it's pretty cool.