Did the skeleton break, or did the flesh completely separate? If the latter, it's commonly referred to as polyp bailout. I don't know any cases of saving a polyp from bailout, but it may be possible. But it's likely a lost cause. If you try to save it, a mushroom box is probably your best bet.
Definitely worth a shot. There's a VERY small chance of it living/regenerating skeleton. I'm not aware of it happening, but it's a sessile coral's last ditch attempt at self-preservation. I'm aware of one case of a totally different coral (elegance) attaching to a tile and generating skeleton. Was probably posted on this forum.
