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Crystal systems that have space groups assigned to a common lattice system are combined into a crystal family. The seven crystal systems are triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic. Informally, two crystals are in the same crystal system if they have similar symmetries (though there are many exceptions).
A crystal system is a set of point groups in which the point groups themselves and their corresponding space groups are assigned to a lattice system (see table in Crystal system#Crystal classes). The trigonal crystal system consists of the 5 point groups that have a single three-fold rotation axis, which includes space groups 143 to 167.
Category: Trigonal crystal system. 7 languages. ... Chemical elements with trigonal structure (1 C, 2 P) T. Trigonal crystals (4 C, 2 P) Trigonal minerals (21 C, 200 ...
A crystal system is a set of point groups in which the point groups themselves and their corresponding space groups are assigned to a lattice system. Of the 32 point groups that exist in three dimensions, most are assigned to only one lattice system, in which case the crystal system and lattice system both have the same name.
Trigonal crystal system; Number Point group Orbifold Short name Full name Schoenflies Fedorov Shubnikov Fibrifold; 143: 3: P3: P 3 38s (: ...
Media in category "Trigonal minerals" The following 2 files are in this category, out of 2 total. Cinnabar on Dolomite.jpg 1,763 × 1,254; 1.4 MB.
Crystal system Indicatrix Optical sign Birefringence Color in plain polars ... Trigonal: Uniaxial (-) 0.09: None Cristobalite: Tetragonal (pseudoisometric) Uniaxial ...
If the crystal system is not trigonal then the lattice system is of the same type. If the crystal system is trigonal, then the lattice system is hexagonal unless the space group is one of the seven in the rhombohedral lattice system consisting of the 7 trigonal space groups in the table above whose name begins with R. (The term rhombohedral ...