What is ELEMENTARY KNOWLEDGE ON SYMMENTRY, ELEMENTS OF CRY STALLOGRAPHIC SYSTEM
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In crystallography, symmetry is used to characterize crystals, identify repeating parts of molecules, and simplify both data collection and nearly all calculations. Also, the symmetry of physical properties of a crystal such as thermal conductivity and optical activity must include the symmetry of the crystal.1 Thus, a thorough knowledge of symmetry is essential to a crystallographer. A clear, brief description of crystallographic symmetry was prepared by Robert Von Dreele.
An object is described as symmetric with respect to a transformation if the object appears to be in a state that is identical to its initial state, after the transformation. In crystallography, most types of symmetry can be described in terms of an apparent movement of the object such as some type of rotation or translation. The apparent movement is called the symmetry operation. The locations where the symmetry operations occur such as a rotation axis, a mirror plane, an inversion center, or a translation vector are described as symmetry elements.