What is a rock which contains fine-grained feldspar and quartz?
well it is covalent because the 2 types of atoms bonded are non metals
The bonds in SiO2 have a very high covalent character, yet SiO2 exists as a network of atoms, and therefore, has high melting and boiling points. The bottom line: the Si-O bonds in quartz are covalent. ============ Follow up ============== Predominately covalent bonds also exist between metals and nonmetals.
