mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Hardness: 6.5-7.5. Color: Deep red to reddish-black. Luster: Vitreous to resinous. Crystal structure: Isometric (dodecahedral). Cleavage: None. Specific gravity: 4.1-4.3.

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

Identified June 8, 2026More mineral →

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Physical properties

Hardness: 6.5-7.5. Color: Deep red to reddish-black. Luster: Vitreous to resinous. Crystal structure: Isometric (dodecahedral). Cleavage: None. Specific gravity: 4.1-4.3.

Formation & geological history

Formed under high pressure and temperature in metamorphic rocks like mica schists, gneisses, and eclogites, often during regional metamorphism of clay-rich sediments.

Uses & applications

Used as an abrasive in sandpaper and water-jet cutting, as a gemstone in jewelry, and as a popular collector's mineral.

Geological facts

Garnets have been used as gemstones since the Bronze Age. The name almandine is derived from Alabanda, an ancient city in Asia Minor where these stones were historically cut.

Field identification & locations

Identify by its characteristic deep red color, high hardness, and dodecahedral crystal habits. Commonly found in metamorphic belts globally, including parts of the USA, India, and Sri Lanka.