How can anyone differentiate crystalline and amorphous solids?

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.

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