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Transcript
2-AxisOf Symmetry Axis:- It is an imaginary line pass by crystal center, that is means, If the crystal is rotated around this line (360 degree), face, edge and any line will repeated twice or more. 2-fold axis (Diad) 3-fold axis (Triad) 4-fold axis (Tetrad) 6-fold axis (Hexad) 3-Center Of Symmetry It is an imaginary, Central point into Crystal. The distance between faces , edges, and angles in certain side is equal to the other in opposite side. 4-Inversion Axis Of symmetry This element collects between rotation symmetry and Inversion through the center of crystal . If the crystal has double inversion at rotation axis, i needs crystal rotation for(180Ù )firstly, then inversion every face, edge, or surface in crystal through symmetry center until the crystal takes it situation in vacancy. This Axis is called (Two-fold inversion) or(2). So for (3) , (4) and (6). Extraction Elements of symmetry are:- 1- Plane of symmetry. 2- Axis of symmetry. 3- Center of symmetry. 4- Inversion axis of symmetry. 16
