COVALENT DUDE. Definetly covalent. You can state it, this is something that is almost ALWAYS true.
I'd bet my life on it.
But be careful, with the covalent bonds because there is intermolecular and intramolecular.
For example if you have a H2 gas floating about.
The H---H bond would be a strong covalent bond.
But the inter molecular bonds between a H2 ----- and another H2 molecule would be weak dispersion forces.
Or in the case of polar molucules, like water, weak dipole-dipole/hydrogen bondnig forces.
Even though the bonds BETWEEN molecules are week, the covalent bonds WITHIN the molecule itself are the strongest there is.
But if it is as lordhokage said a covalent network, then it is stronger still since the whole thing is made up of covalent bonds and no intermolecular forces, as diamond was used as the prime example, i do belive , the strongest thing known. That is, the amount of heat that would be needed to break those bonds is ... astronomical.
but in the case of ionic, wouldn't disolving it in water break the bonds? if not then isn't it closer to covalent?