mineral

Garnet

Almandine (Fe3Al2(SiO4)3)

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

Hardness: 6

Identified June 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily during regional metamorphism of clay-rich sedimentary rocks like shale, creating mica schists. They can also occur in igneous rocks such as pegmatites. Found in metamorphic belts globally.

Uses & applications

Commonly used as an abrasive in sandblasting and waterjet cutting, as a filtration medium, and as a gemstone in jewelry. Collector specimens are highly valued for their crystal symmetry.

Geological facts

Garnets have been used as gemstones since the Bronze Age. The name comes from the Latin word 'granatus' meaning grain or seed, likely referring to its resemblance to pomegranate seeds.

Field identification & locations

Identify in the field by its characteristic 12-sided (dodecahedral) shape, high hardness (scratches glass), and dark red color. Often found embedded in silvery mica schist. Common in places like New York (USA), India, and Brazil.