Trigonal System
Trigonal System
(Rhombohedral System) - Axes and angles in this system are similar to the Hexagonal System, and the two systems are often combined as Hexagonal. In the cross-section of a Hexagonal crystal, there will be six sides. In the cross-section of a Trigonal crystal there will be three sides.
Based on a triangular inner structure.
Crystal shapes include:
- Three-sided prisms or pyramids
- Rhombohedra
- Scalenohedra
Common Trigonal Crystals: