Diamond:Diamond is an example of a covalent network solid where each carbon atom forms four strong covalent bonds with its neighboring carbon atoms, resulting in an extremely hard substance.
Quartz: Quartz is another example of a covalent network solid consisting of silicon and oxygen atoms bonded together in a repeating pattern, forming crystals that are commonly used in jewelry.
Graphite:Although not technically considered a true covalent network solid, graphite is made up of layers of carbon atoms arranged hexagonally. Within each layer, the carbon atoms are bonded through strong covalent bonds similar to those found in diamond.