In crystallography, the rhombohedral (or trigonal) crystal system is one of the 7 lattice point groups. A crystal system is described by three basis vectors. In the rhombohedral system, the crystal is described by vectors of equal length, all three of which are not mutually orthogonal. The rhombohedral system can be thought of as the cubic system stretched along a body diagonal.
In some classification systems, the rhombohedral system is grouped into a larger hexagonal system.
The point groups that fall under this crystal system are listed below, followed by their representations in international notation and Schoenflies notation, and example crystals.
In Europe, one of the front-runners in the jam-band scene is Germany's Trigon.
Trigon are highly adventurous and are not afraid of pushing beyond the conventions of classic rock or straight-edged progressive rock - this is far more interesting and stimulating.
Trigon wurde ein wahres Klangerlebnis da hier wirklich experimentelle Musik mit riesigen Klangteppichen von der Bühne kam.
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