mineral

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Hardness: 6.5-7.5. Color: Deep red to reddish-brown. Luster: Vitreous to resinous. Crystal Structure: Isometric (dodecahedral habits). Cleavage: None (conchoidal fracture). Specific Gravity: 3.5-4.3.

Hardness: 6
Color: Deep red to reddish-brown
Luster: Vitreous to resinous

Identified May 17, 2026More mineral →

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Physical properties

Hardness: 6.5-7.5. Color: Deep red to reddish-brown. Luster: Vitreous to resinous. Crystal Structure: Isometric (dodecahedral habits). Cleavage: None (conchoidal fracture). Specific Gravity: 3.5-4.3.

Formation & geological history

Forms primarily in metamorphic rocks like mica schists, gneisses, and amphibolites due to the regional metamorphism of clay-rich sedimentary rocks (pelites). Can also occur in some igneous rocks.

Uses & applications

Used as an abrasive (sandpaper, waterjet cutting), in filtration media, and as a gemstone in jewelry. It is also a popular collector's mineral.

Geological facts

Garnet is the birthstone for January. Almandine is the most common variety of the garnet group. Some garnets show an asterism effect (star garnets) when cut into cabochons.

Field identification & locations

Identified in the field by its characteristic 'soccer ball' (dodecahedral) crystal shape, deep red color, and lack of cleavage. Commonly found in metamorphic terrains worldwide, notably in New York (USA), India, and Brazil.