mineral

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3

AI-generated identification · may be incorrect

Hardness: 6.5-7.5. Color: Deep red to brownish-red. Luster: Vitreous to resinous. Crystal Structure: Isometric (often dodecahedral). Cleavage: None, exhibits subconchoidal fracture.

Hardness: 6
Color: Deep red to brownish-red
Luster: Vitreous to resinous

Identified June 7, 2026More mineral →

Explore Garnet in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7.5. Color: Deep red to brownish-red. Luster: Vitreous to resinous. Crystal Structure: Isometric (often dodecahedral). Cleavage: None, exhibits subconchoidal fracture.

Formation & geological history

Formed under high temperature and pressure in metamorphic rocks like schist and gneiss, or as an accessory mineral in igneous rocks.

Uses & applications

Used as an industrial abrasive (sandpaper, waterjet cutting), a gemstone in jewelry, and a geological dating tool.

Geological facts

Garnet is the birthstone for January. While red is most common, it can occur in almost any color except blue. It has been used as a gemstone since the Bronze Age.

Field identification & locations

Identify by its 'equant' or rounded crystal shape, glassy luster, and high hardness. Commonly found in metamorphic terrains such as the Adirondacks or the Alps.