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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 ...
This category is for crystals in the hexagonal system, not for those in the trigonal system which is also part of the hexagonal family. Subcategories This category has the following 9 subcategories, out of 9 total.
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).
Hexagonal crystals (9 C) Hexagonal minerals (18 C, 105 P) N. Nickel arsenide structure type (10 P) W. Wurtzite structure type (14 P) Pages in category "Hexagonal ...
Magono and Lee devised a classification of freshly formed snow crystals that includes 80 distinct shapes. They are listed in the following main categories (with symbol): [25] Needle crystal (N) – Subdivided into: Simple and combination of needles; Columnar crystal (C) – Subdivided into: Simple and combination of columns
Slower crystal growth from colder and drier atmospheres produces more hexagonal symmetry. [2] Depending on environmental temperature and humidity, ice crystals can develop from the initial hexagonal prism into many symmetric shapes. [4] Possible shapes for ice crystals are columns, needles, plates and dendrites. Mixed patterns are also possible ...
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 former is called α-quartz; the latter is β-quartz. The ideal crystal shape is a six-sided prism terminating with six-sided pyramid-like rhombohedrons at each end.
A crystal's crystallographic forms are sets of possible faces of the crystal that are related by one of the symmetries of the crystal. For example, crystals of galena often take the shape of cubes, and the six faces of the cube belong to a crystallographic form that displays one of the symmetries of the isometric crystal system. Galena also ...