I know of coral only that is the hard calcareous skeleton of the marine coelenterate polyps; and that this red coral iss called of a sclerobasic group; and other facts of the kind; but I do not know if it iss supposed to resist impact and heat.
"African Camp Fires"
Stewart Edward White
Polyp An individual coelenterate of simple structure that is fixed temporarily or permanently by one end of a more or less cylindrical body and possesses a mouth at the other end.
"Freshwater Sponges, Hydroids & Polyzoa"
Nelson Annandale