These are solids which have a regular periodic arrangement in their component parties, bounded by flat faces, orderly arranged in reference to one an other, which converge at the edges and vertices. A crystal is symmetrical about its certain elements like points, lines or planes and if it rotated about these elements, it is not possible to distinguish its new position from the original position. This symmetry is an important characteristic based on internal structure of crystal. Symmetry helps one to classify crystals and describing their behavior. At temperatures below that of crystallization, the crystalline state is stable for all solids.
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