- Crystalline solids
- Amorphous solids
In crystalline solids, the atoms or molecules are arranged in an order, extending over a large volume of the crystal. All the bonds have the same bond strength. Therefore, such solids have a precise melting point. They also have a uniform chemical composition. Examples of crystalline solids are quartz, calcite, rocksalt, sugar, mica and diamonds.Amorphous solids on the other hand, do not have a regular and periodic arrangement of atoms. All the bonds are not equally strong. These solids do not have a precise melting point.
Examples of amorphous solids are rubbers, glass, plastic, cement and paraffin.