Crystal System Point Groups

Question 1

triclinic

Answer 1

centrosymmetric: 1 bar
noncentrosymmetric nonenantiomorphous: -
noncentrosymmetric enantiomorphous: 1

Question 2

monoclinic

Answer 2

centrosymmetric: 2/m
noncentrosymmetric nonenantiomorphous: m
noncentrosymmetric enantiomorphous: 2

Question 3

orthorhombic

Answer 3

centrosymmetric: 2/m 2/m 2/m
noncentrosymmetric nonenantiomorphous: mm2
noncentrosymmetric enantiomorphous: 222

Question 4

tetragonal

Answer 4

centrosymmetric: 4/m 2/m 2/m, 4/m
noncentrosymmetric nonenantiomorphous: 4mm, 4 bar m2, 4 bar
noncentrosymmetric enantiomorphous: 422, 4

Question 5

trigonal

Answer 5

centrosymmetric: 3 bar 2/m, 3 bar
noncentrosymmetric nonenantiomorphous: 3m
noncentrosymmetric enantiomorphous: 32, 3

Question 6

hexagonal

Answer 6

centrosymmetric: 6/m 2/m 2/m, 6/m
noncentrosymmetric nonenantiomorphous: 6mm, 6 bar m2, 6 bar = 3/m
noncentrosymmetric enantiomorphous: 622, 6

Question 7

cubic

Answer 7

centrosymmetric: 2/m 3 bar, 4/m 3 bar 2/m noncentrosymmetric nonenantiomorphous: 4 bar 3m
noncentrosymmetric enantiomorphous: 23, 432