mineral

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Hardness: 6.5 - 7.5; Color: Deep brownish-red to black; Luster: Vitreous to resinous; Crystal System: Isometric (often dodecahedral); Cleavage: None (indistinct); Specific Gravity: 3.5 - 4.3.

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

Identified June 27, 2026More mineral →

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Physical properties

Hardness: 6.5 - 7.5; Color: Deep brownish-red to black; Luster: Vitreous to resinous; Crystal System: Isometric (often dodecahedral); Cleavage: None (indistinct); Specific Gravity: 3.5 - 4.3.

Formation & geological history

Formed under high-pressure and high-temperature conditions in metamorphic rocks like schists and gneisses, or as an accessory mineral in igneous rocks like pegmatites. It is part of a solid-solution series with pyrope.

Uses & applications

Commonly used as a gemstone in jewelry and as an abrasive in industrial applications (waterjet cutting, sandblasting) due to its hardness and lack of cleavage.

Geological facts

Garnet is the January birthstone. The name 'Garnet' comes from the Latin 'granatus', meaning seed-like, referring to its resemblance to pomegranate seeds. Almandine is the most common member of the garnet group.

Field identification & locations

Identify in the field by its distinct crystal shape (dodecahedrons), deep red color when held to light, and high hardness. Commonly found in metamorphic terrains such as the Adirondack Mountains or the river beds of India and Brazil.