mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Hardness: 6.5-7.5 on Mohs scale. Color: Deep red, reddish-brown to brownish-black. Luster: Vitreous to resinous. Crystal structure: Isometric (often dodecahedral). Cleavage: None (conchoidal fracture). Specific gravity: 4.1-4.3.

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

Identified June 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed in metamorphic rocks such as mica schists and gneisses during regional metamorphism of clay-rich sediments. It can also occur in some igneous rocks like granites or pegmatites.

Uses & applications

Used primarily as an industrial abrasive for sandblasting and water-jet cutting. Transparent, high-quality specimens are used in jewelry as gemstones. It is also a popular specimen for mineral collectors.

Geological facts

Garnet is the birthstone for January. Almandine is the most common member of the garnet group and has been used since ancient times for decorative purposes and intaglios.

Field identification & locations

Identify by its distinctive crystal shape (dodecahedron), high density, and lack of cleavage. In the field, look for reddish crystals embedded in schist or found as heavy sand minerals in stream beds. Common in metamorphic belts worldwide.