You can cut it with a torch or a plasma cutter. You can grind it with a regular hard rock stone or a flapper wheel. I think it would be possible to overheat it with a grinder, but not letting it get too hot and letting it cool off in the air would be best. If you shock it with water it might get brittle. I have never actually tried it to see if it gets brittle, that's more of a general practice. I have also drilled it with a high quality drill bit.