2. Crystal Classes, 32 Cardboard Models
Presenting 32 cardboard models of crystal systems as described in Crystal and
Crystal Growing by Alan Holden and Phyllis Morrison, MIT Press 1999
5. Crystal Class 4/m bar 3 2/m - Oh
Three 4-fold axes through opposite faces
Four 3-fold axes through opposite corners
Six 2-fold axes through opposite edges
Three planes parallel to faces, cubic planes
Six planes through opposite edges, dodecahedral planes
Center of symmetry
6.
7.
8. Crystal Class Bar 4 3 m - Td
Four 3-fold axes
Three 2-fold axes through opposite faces
Six dodecahedral planes
9.
10. Crystal Class 2/m bar 3 - Th
Four 3-fold axes
Three 2-fold axes through opposite faces
Three cubic planes
Center of symmetry
11.
12. Crystal Class 4 3 2 - O
Three 4-fold axes
Four 3-fold axes
Six 2-fold axes through opposite edges
13.
14. Crystal Class 2 3 - T
Four 3-fold axes
Three 2-fold axes through opposite faces
18. Crystal Class - 4/m 2/m 2/m D4h
One 4-fold axes through the two square faces
Four 2-fold axes perpendicular to the 4-fold axis, two of them throuth opposite
faces and the other two through opposite edges
Five planes (a) 0ne perpendicular to the 4-fold axis (b) two containing that axis
and parrallel to opposite faces (c) two containing that axis and passing through
opposite edges
Center of symmetry
19.
20.
21. Crystal Class - 4mm C4v
One four-fold axis
Four planes containing that axis
22.
23.
24. Crystal Class - 4/m C4h
One four-fold axis
One plane perpendicular to that axis
25.
26.
27. Crystal Class - 422 D4
One four-fold axis
Four two fold axis
28.
29.
30. Crystal Class - bar 4 2 m D2d
4-fold alternating axis
Two 2-fold axes perpendicular to the 4-fold alternating axis through opposite
edges
Two planes containing the 4-fold alternating axis parrallel to opposite faces
41. Crystal Class 2/m 2/m 2/m - D2h
Three mutually perpendicular 2 fold axes through opposite faces
Three planes parallel to opposite faces
Center of symmetry
42.
43.
44. Crystal Class mm2 - C2v
One 2 fold axis
Two planes containing that axis
71. Crystal Class 6/m 2/m 2/m D6h [1]
One 6 fold axis
Six 2 fold axes perpendicular to the 6 fold axis three of them through opposite
faces and three through opposite edges
Seven planes a) one perpendicular to the 6 fold axis
b) three containing that axis and passing through opposite faces
c) three containing that axis and passing through opposite edges
Center of gravity
72.
73.
74. Crystal Class 6mm - C6v [2]
One 6 fold axis, six planes containing that axis
75.
76.
77. Crystal Class 6/m - C6h [3]
One 6 fold axis, one palne perpendicular to that axis center of symmetry
86. Crystal Class bar 6 m 2 - D3h [6]
One 3-fold axis, three 2-fold axes through opposite faces, three planes through
opposite faces, one plane perpendicular to the 3-fold axis
87.
88.
89. Crystal Class bar 6 - C3h [7]
One 3-fold axis
One plane perpendicular to that axis
90.
91.
92. Crystal Class 8
One 3-fold axis which is a 6-fold alternating axis, inversion axis
Three 2-fold axes passing through opposite faces
Three planes passing through opposite edges
Center of symmetry
93.
94.
95. Crystal Class 3 m - C3v [9]
One 3-fold axis,three planes through opposite edges
96.
97.
98. Crystal Class bar 3 2/m - D3d [10]
One 3-fold axis
Three 2-fold axes through opposite faces
99.
100.
101. Crystal Class bar 6 - C3h [11]
One 6-fold alternating axis
Center of symmetry