Search results
Results from the WOW.Com Content Network
A crystal family is determined by lattices and point groups. It is formed by combining crystal systems that have space groups assigned to a common lattice system. In three dimensions, the hexagonal and trigonal crystal systems are combined into one hexagonal crystal family. Hexagonal hanksite crystal, with threefold c-axis symmetry
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). The trigonal crystal system consists of the 5 point groups that ...
Some directions and planes are defined by symmetry of the crystal system. In monoclinic, trigonal, tetragonal, and hexagonal systems there is one unique axis (sometimes called the principal axis) which has higher rotational symmetry than the other two axes. The basal plane is the plane perpendicular to the principal axis in these crystal ...
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 ...
For example, 2 1 is a 180° (twofold) rotation followed by a translation of ... Trigonal crystal system; Number Point group Orbifold Short name Full name Schoenflies
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: Trigonal: Crystal class: Hexagonal scalenohedral (3 m) H-M symbol: (3 2/m) Space group: R 3 c: ... One of the best examples is the Calcite Quarry in ...
Quartz belongs to the trigonal crystal system at room temperature, and to the hexagonal crystal system above 573 °C (846 K; 1,063 °F). The ideal crystal shape is a six-sided prism terminating with six-sided pyramid-like rhombohedrons at each end.