Having half the number of planes required for symmetry of the holohedral form.
- Hexagonal bR crystals of space group P6 3 often exhibit a perfect hemihedral twinning.
- Depending on the hemihedral twin-fraction, there are two different scenarios that must be understood.
- A regular or twin intergrowth between two hemihedral crystals frequently takes place and results in the production of a holohedral form.
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