mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Hardness: 7-7.5 (Mohs scale); Color: Dark red to brownish-black; Luster: Vitreous to resinous; Crystal structure: Isometric (dodecahedral); Specific gravity: 4.1-4.3.

Hardness: 7-7
Color: Dark red to brownish-black
Luster: Vitreous to resinous

Identified June 22, 2026More mineral →

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Physical properties

Hardness: 7-7.5 (Mohs scale); Color: Dark red to brownish-black; Luster: Vitreous to resinous; Crystal structure: Isometric (dodecahedral); Specific gravity: 4.1-4.3.

Formation & geological history

Formed in regional metamorphic environments within rocks such as mica schists and gneisses. This high-pressure, high-temperature crystallization can occur across various geological ages.

Uses & applications

Used as an abrasive in sandblasting and water-jet cutting; high-quality specimens are faceted for jewelry (January birthstone); also used as a gemstone collector's item.

Geological facts

Almandine is the most common member of the garnet mineral group. Its name is a corruption of alabandicus, which is the name of a town in Asia Minor where these stones were traditionally cut.

Field identification & locations

Identify by its dodecahedral crystal habit (12 sides), dark red streak, and exceptional hardness. Commonly found in metamorphic terrains such as the Alps, New York (Gore Mountain), and India.