- Rhombohedral crystal system
crystallography, the rhombohedral (or trigonal) crystal systemis one of the seven lattice point groups, named after the two-dimensional rhombus. A crystalsystem is described by three basis vectors. In the rhombohedral system, the crystal is described by vectors of equal length, of which all three are not mutually orthogonal. The rhombohedral system can be thought of as the cubic systemstretched diagonally along a body. "a" = "b" = "c"; .In some classification schemes, the rhombohedral system is grouped into a larger hexagonal system.
There exists only one rhombohedral
List of particulars
The point groups which fall under this crystal system are listed below, followed by their representations in international notation (
Hermann-Mauguin notation) and Schoenflies notation, and example crystals.
* Hurlbut, Cornelius S.; Klein, Cornelis, 1985, "Manual of Mineralogy", 20th ed., pp. 78 - 89, ISBN 0-471-80580-7
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