i think you misunderstood me. If the stuff Camulus added to the ZPM was responsible for the big explosion, even pure E=mc^2 wouldn't cover half the released energy. It would be many orders of magnitude more powerful than Naquahdah.Theory-
Because that was probably just some sort of chemical reaction, and the chemical reaction would have been based on interactions with the make up of the crystal.
Naquadah fission reactors would be more efficient and powerful.
In short: it can't be the element. The stuff Camulus added was purely a trigger for electricity. The trigger would uncontrollably release the energy.