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2Â¥: Originally posted by lich666 at 2015-11-24 15:22:18
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3Â¥2015-11-24 16:48:44
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http://pd.chem.ucl.ac.uk/pdnn/symm2/polar1.htm


Crystal System        Polar Point Groups
Triclinic        1
Monoclinic        2        m
Orthorhombic        mm2
Tetragonal        4        4mm
Trigonal        3        3m
Hexagonal        6        6mm
Cubic        (None)
4Â¥2015-11-24 17:21:00
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A group is polar if the direction t and -t are not related to each other by a symmetry operation

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