There is a regular arrangement of particles in a crystalline solid that will result in a well-defined crystal array. In an amorphous solid, there is no regular arrangement of particles.
| Amorphous solids | Crystalline solids |
| This is the shapeless, disordered, and irregular arrangement of the constituent particles of a solid. | Crystalline solids have a definite shape with orderly arranged ions, molecules or atoms in a three-dimensional pattern. |
| Amorphous solids do not have definite melting points | Crystalline solids, on the other hand, have a sharp melting point. |
| Amorphous is called isotropic because of similar physical properties from either direction. | Crystalline solids possess different electrical conductivity, thermal conductivity, refractive index and mechanical strength within a crystal. |
| Amorphous solids include glass, rubber and polymers. | Examples of a crystalline solid include NaCl, sugar and diamond. |
