en.wikipedia.org/wiki/Hexagonal_crystal_systemThe hexagonal crystal system consists of the 7 point groups that have a single six-fold rotation axis. These 7 point groups have 27 space groups (168 to 194), all of which are assigned to the hexagonal lattice system. Graphite is an example of a crystal that crystallizes in the hexagonal crystal system.
www.britannica.com/science/hexagonal-systemHexagonal system, one of the principal categories of structures to which a given crystalline solid can be assigned. Components of crystals in this system are located by reference to four axes—three of equal length set at 120 degrees to one another and a fourth axis perpendicular to the plane of the other three.
uwaterloo.ca/earth-sciences-museum/resources/.../hexagonal-crystal-systemHexagonal crystal system. The hexagonal system has four crystallographic axes consisting of three equal horizontal, or equilateral axes at 120 degrees to each other, as well as one vertical axis which is perpendicular to the other three. This vertical axis can be longer or shorter than the horizontal axes.
metafysica.nl/hexagonal_1.htmlWith all this we have found yet another basic face compatible with the Hexagonal Crystal System, namely the face 2a : 2a : -a : ~c. The last Form to be discussed is the basic pinacoid. It consists of two faces, parallel to each other and to the equatorial plane of the system of crystallographic axes. This Form is, like the prisms, an open Form ...
en.wikipedia.org/wiki/Crystal_systemA lattice system is a class of lattices with the same set of lattice point groups, which are subgroups of the arithmetic crystal classes.The 14 Bravais lattices are grouped into seven lattice systems: triclinic, monoclinic, orthorhombic, tetragonal, rhombohedral, hexagonal, and cubic.. In a crystal system, a set of point groups and their corresponding space groups are assigned to a lattice system.
www.britannica.com/science/trigonal-systemTrigonal system, a structural category of crystalline solids sometimes considered as a subdivision of the hexagonal system. The unit cell has a single line called an axis of three-fold symmetry about which the cell can be rotated by 120 degrees to produce a face identical to the face presented in the starting position.
www.periodni.com/crystal-systems-and-bravais-lattices.htmlHexagonal crystal system is based on four crystallographic axes. Three of the axes (denoted by a 1, a 2, and a 3) are of the same length and lie in the hexagonal (basal) plane at 120° to one another (between the positive ends).A fourth axis (c), longer or shorter than other three, is perpendicular to this plane.Therefore, it is sufficient to give the a and c lattice parameters for the ...
www.gemsociety.org/article/mineral-habitsIn crystallography, mineral habits refer to the way crystals form within a specific mineral. In the article, “How Gems Are Classified,” I mentioned that, at the molecular level, diamond looks like two pyramids attached at their bases and quartz has six sides. These are examples of mineral habits or crystal systems. Table of Contents:
asbury.com/resources/education/graphite-101The Hexagonal Crystal System. A good understanding of graphitic materials requires a basic understand of the crystal system to which the graphite structure belongs. Although a thorough discussion of crystallography is beyond the scope of this article it is important to understand that carbon atoms in the graphite structure are arranged in a ...
www.geologyin.com/2014/11/crystal-structure-and-crystal-system.htmlThe hexagonal crystal system is further broken down into hexagonal and rhombohedral divisions. Every crystal class which belongs to a certain crystal system will share a characteristic symmetry element with the other members of its system. For example, all crystals of the isometric system possess four 3-fold axes of symmetry which proceed ...