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you can determine crystal class and crystal system of a crystal from its symmetry by 3 criteria of symmetry.1.plane of symmetry:this divides the crystal into two such that one half of it is a mirror image to the other,e.g a halite(cube) has 9 plane of symmetry.(2)axis of symmetry:this is the axis about which the rotation takes place when a crystal wants to occupy position in space more than one time in a complete turn.(3).centre of symmetry:this when the like faces,edges e.t.c are arrange in pairs in corresponding position on the opposite side of the central point.

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Q: How you determine the crystal class and crystal system of a crystal from its symmetry content?
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