The characteristics of covalent network crystals are as follows :
- The constituent particles in these solids are atoms.
- The atoms in these crystals are held by covalent bonds forming a rigid three dimensional network which gives a giant molecule. Hence, the entire crystal is a single molecule.
- These crystals are very hard (or hardest) and most incompressible.
- They have high melting points and boiling points.
- Since the electrons are localised they are poor conductors of heat and electricity.
- Example : Quartz (SiO2), diamond.
