Minerals can form deep inside earth’s crust by

Crystallization of melted materials

Explanation:

 The minerals are formed by the crystallization process of the melted materials inside the earth crust. The crystallization process is the purification technique in which the minerals are arranged in the 3-D pattern. It is also known as liquid-solid separation technique.

The minerals are usually formed by the crystallization process in which the atoms are arranged for forming the materials with the help of crystal structure.  

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