Structure Trigonal

(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:

  • Three-sided prisms or pyramids
  • Rhombohedra
  • Scalenohedra

Some Trigonal Crystals:

  • Agate
  • Amethyst
  • Aventurine
  • Calcite
  • Carnelian
  • Citrine
  • Hematite
  • Jasper
  • Phenakite
  • Quartz
  • Rhodochrosite
  • Rose Quartz 
  • Ruby, Sapphire
  • Smoky Quartz
  • Tigers Eye
  • Tourmaline

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