Trigonal
Rhombohedral
Three-fold rotational symmetry. Often grouped with Hexagonal.
16 minerals in collection

Minerals of the Trigonal system

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Bright yellow botryoidal brucite cluster on white matrix from Pakistan.
Brucite
Emerald green dioptase crystal cluster displaying full vertical mirror reflection
Dioptase
Black metallic ilmenite with green titanite displaying a vertical reflection.
Ilmenite with Titanite
Plumbogummite
Plumbogummite
Proustite
Proustite
Quartz
Quartz
Quartz (Smoky)
Quartz (Smoky)
Quartz var. Amethyst
Quartz var. Amethyst
Quartz with Fuchsite Phantoms
Quartz with Fuchsite Phantoms
Rhodochrosite ps. Calcite on Galena
Rhodochrosite ps. Calcite on Galena
Ruby
Ruby
Smithsonite
Smithsonite
Smithsonite var. Cuprian
Smithsonite var. Cuprian
Tourmaline on Milky Quartz
Tourmaline on Milky Quartz
Tourmaline var Elbaite
Tourmaline var Elbaite
Tourmaline with Cleavelandite (double-terminated, bi-colored)
Tourmaline with Cleavelandite (double-terminated, bi-colored)