The trigonal crystal system is one of the two crystal systems, with the hexagonal system, that make up the hexagonal crystal family. The cited article, titled Hexagonal crystal family because the system has no separate article, stresses that while commonly confused, the trigonal crystal system and the rhombohedral lattice system are not equivalent, and that there are crystals that have trigonal symmetry but belong to the hexagonal lattice, such as alpha quartz. It records that the family is the union of the hexagonal crystal system and the trigonal crystal system. Materials whose crystals belong to this system, including those described as trigonal or rhombohedral in the atlas, are grouped under this concept.
Connections
Crystal System Of Material
Entity-backed identity for the crystal-system enum value this material already carries, resolved to an earth concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The crystal-system fact itself stays on the material unchanged.
Entity-backed identity for the crystal-system enum value this material already carries, resolved to an earth concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The crystal-system fact itself stays on the material unchanged.
Entity-backed identity for the crystal system this mineral already carries as an enum fact, phase 3 bucket conversion (docs\design_entity_backed_browse_buckets_20260928.md, w-bucketconv-divmore2-0929). The original fact stays on the entry unchanged.
Entity-backed identity for the crystal-system enum value this material already carries, resolved to an earth concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The crystal-system fact itself stays on the material unchanged.
Entity-backed identity for the crystal-system enum value this material already carries, resolved to an earth concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The crystal-system fact itself stays on the material unchanged.
Entity-backed identity for the crystal system this mineral already carries as an enum fact, phase 3 bucket conversion (docs\design_entity_backed_browse_buckets_20260928.md, w-bucketconv-divmore2-0929). The original fact stays on the entry unchanged.
In Discipline
Source Hexagonal Crystal System
Sources
Trigonal Crystal System
Wikipedia, lead sectionQuote, Wikipedia, lead section
While commonly confused, the trigonal crystal system and the rhombohedral lattice system are not equivalent (see section crystal systems below).
Hexagonal Crystal System
In Discipline: Geology, Lead section (in-discipline Geology)Quote, In Discipline: Geology, Lead section (in-discipline Geology)
In crystallography, the hexagonal crystal family is one of the six crystal families, which includes two crystal systems (hexagonal and trigonal) and two lattice systems (hexagonal and rhombohedral).
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