mineral

Almandine Garnet

Almandine - Fe3Al2(SiO4)3

Hardness: 6.5-7.5 on the Mohs scale; Color: Deep red, brownish-red, or purplish-red; Luster: Vitreous to resinous; Crystal structure: Isometric (dodecahedral); Cleavage: None (subconchoidal fracture); Specific Gravity: 3.5 to 4.3

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

Identified March 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in metamorphic rocks like mica schists, gneisses, and amphibolites under high pressure and temperature. It is also found in some igneous rocks. While the mineral itself is found across various geological ages, specimen-bearing schists are often hundreds of millions of years old.

Uses & applications

Commonly used as an abrasive in sandpaper and water-jet cutting due to its hardness. High-quality transparent specimens are used as gemstones in jewelry. It is also a popular specimen for mineral collectors.

Geological facts

Garnet is the official birthstone for January. Almandine is the most common member of the garnet group. In ancient times, garnets were often called 'carbuncles' and were thought to light up the night.

Field identification & locations

Identify in the field by its characteristic 'soccer ball' shape (rhombic dodecahedra), high density, and lack of cleavage. Commonly found in metamorphic terrains such as the Adirondack Mountains, India, and Brazil. Check stream beds near schist outcrops for weathered-out crystals.