If you look at a carbide burr for steel it has a crosscut cutter pattern. If you look at a carbide burr for aluminum it has a single cutter pattern. That's intended to keep the burr from clogging with aluminum. As to using stones? All of the comments are spot on, don't even try.
I should have pointed out the difference between single cut and double cut burrs. Single cut will cut faster and clog less in aluminum but it also makes long very sharp slivers that can ruin your day. Please at least wear good eye protection with either type of cutter. If you have to go to the emergency room with metal in your eye they will show you their grinder. Real close up!
