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 3Hexagonal 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.Hexagonal crystal familyCompared with: It is often mistaken for a separate family, but is grouped here by lattice symmetry.