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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).
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.
The hexagonal crystal family consists of two crystal systems: trigonal and hexagonal. 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).
Crystal structure of table salt (sodium in purple, chlorine in green) In crystallography , crystal structure is a description of ordered arrangement of atoms , ions , or molecules in a crystalline material . [ 1 ]
Crystal system Indicatrix Optical sign Birefringence Color in plain polars ... Trigonal: Uniaxial (-) 0.09: None Cristobalite: Tetragonal (pseudoisometric) Uniaxial ...
Chemical elements with trigonal structure (1 C, 2 P) Crystals in space group 152 or 154 (1 C, 2 P) Crystals in space group 166 (1 C, 1 P) T. Trigonal minerals (21 C ...
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 ...
The degree of translation is then added as a subscript showing how far along the axis the translation is, as a portion of the parallel lattice vector. For example, 2 1 is a 180° (twofold) rotation followed by a translation of 1 / 2 of the lattice vector. 3 1 is a 120° (threefold) rotation followed by a translation of 1 / 3 of ...