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In crystallography, symmetry is a fundamental concept used to describe the orderly and repetitive arrangement of atoms in a crystal lattice. Symmetry elements are specific geometric entities about which symmetry operations are performed. These elements define the inherent regularity in crystal structures and are essential for classifying crystals into various systems and classes. The three primary elements of symmetry are the axis of rotation, the mirror plane, and the center of symmetry, each of which can be illustrated with examples from minerals. The axis of rotation is an imaginary line about ________ ___ ________ ___ ___.
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