What Is The Difference Between Crystalline And Noncrystalline Structures In Materials?

What Is The Difference Between Crystalline And Noncrystalline Structures In Materials? In a crystalline solid, all the atoms are arranged in a periodic manner in all three dimensions whereas in a non-crystalline solid the atomic arrangement is random or non periodic in nature. A crystalline solid can either be a single crystalline or a polycrystalline.