KnowraTrigonal crystal systemLinked fromLinked fromThe 7 pages that link to Trigonal crystal system, each with the reason it gives.All 7Broader topic 2Related 2Compared with 3Crystal systemBroader topic: Its symmetry is distinct, though its lattices are often described using hexagonal axes.Hexagonal crystal systemCompared with: Trigonal and hexagonal crystals can share hexagonal axes, but belong to distinct crystal systems.Tetragonal crystal systemCompared with: Its principal rotational symmetry is threefold rather than tetragonal's fourfold.Rhombohedral crystal systemRelated: Rhombohedral lattices belong to the trigonal crystal system, despite the different naming scheme.TourmalineBroader topic: Tourmaline’s trigonal symmetry governs its elongated crystals and directional physical properties.RhodochrositeRelated: Rhodochrosite crystals have trigonal symmetry.Hexagonal crystal familyCompared with: It is often mistaken for a separate family, but is grouped here by lattice symmetry.