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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).
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
Pages in category "Hexagonal crystal system" This category contains only the following page. This list may not reflect recent changes. W. Wurtzite (crystal structure)
The hexagonal crystal family is split into two subsets, called the rhombohedral and hexagonal lattice systems. Crystal families (6 in three dimensions) The point group of a space group does not quite determine its lattice system, because occasionally two space groups with the same point group may be in different lattice systems.
In Hermann–Mauguin notation, space groups are named by a symbol combining the point group identifier with the uppercase letters describing the lattice type.Translations within the lattice in the form of screw axes and glide planes are also noted, giving a complete crystallographic space group.
Lonsdaleite (named in honour of Kathleen Lonsdale), also called hexagonal diamond in reference to the crystal structure, is an allotrope of carbon with a hexagonal lattice, as opposed to the cubical lattice of conventional diamond.
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.
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