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-systemThe 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. The system has the following forms: Prism Pinacoid Dipyramid Ditrigonal Pyramid Trigonal Prism
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.
metafysica.nl/hexagonal_1.htmlWith it we have yet another basic face compatible with the Hexagonal Crystal System, namely the face a : ~a : -a : ~c. The next Form is the deuteroprism. It can be derived from the deuteropyramid by steepening its sides till they are vertical. Like the protoprism any horizontal section of it is a regular hexagon.
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. [toc] How are Crystal Systems Defined?
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.htmlMinerals of the hexagonal crystal system are referred to three crystallographic axes which intersect at 120° and a fourth which is perpendicular to the other three. This fourth axis is usually depicted vertically. The hexagonal crystal system is divided into the hexagonal and rhombohedral or trigonal divisions.
www.merriam-webster.com/dictionary/hexagonal%20systemHexagonal system definition is - a crystal system characterized by three equal lateral axes intersecting at angles of 60 degrees and a vertical axis of variable length at right angles (as in the hexagonal prism).