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What is the concept of crystal

Crystals: solids with periodic repeating arrangement of internal plasmas in three dimensions

There are three characteristics of crystals

(1) Crystals have a neat and regular geometrical shape.

(2) Crystals have a fixed melting point and the temperature remains constant throughout the melting process.

(3) Crystals are characterized by anisotropy: there is a distinction between crystalline and amorphous substances (amorphous solids), while amorphous solids do not have the above characteristics.