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The minimum structural unit (the dimer) that, when acted upon by space group symmetry operations, generates the full crystal structure.
Three of these dimer units are arranged around a threefold rotation axis to form a hexamer, which takes the shape of an oblate spheroid.
Animations, videos and 3D models for teaching space-group symmetry
This content is part of a pedagogical resource focusing on teaching crystallographic symmetry, with related, comprehensive information available on the Bilbao Crystallographic Server. How the ? A deeper look into rhombohedral/hexagonal crystal packing ?
The video dv5020sup5.mp4 shows the "action of symmetry operations on the asymmetric unit," specifically how the atoms move, rotate, or translate. Key Concepts Illustrated in the Video
The insulin dimer acts as the asymmetric unit within a crystal structure. It is a "giant" unit because it consists of hundreds of atoms.
Zn ions, for example, are located directly on the rotation axis.
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