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Crystallization or Crystallisation is the (natural or artificial) process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.

Potash alum (Fitkari) is highly soluble in water. ... The insoluble impurities are removed by filtration. The solution is concentrated and then cooled. On cooling pure crystals of alum separate