mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Hardness: 6.5-7.5 on Mohs scale; Color: Red-brown to brownish-orange; Luster: Vitreous to resinous; Crystal structure: Isometric (dodecahedral); Specific gravity: 4.1-4.3

Hardness: 6
Color: Red-brown to brownish-orange
Luster: Vitreous to resinous

Identified June 13, 2026More mineral →

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Physical properties

Hardness: 6.5-7.5 on Mohs scale; Color: Red-brown to brownish-orange; Luster: Vitreous to resinous; Crystal structure: Isometric (dodecahedral); Specific gravity: 4.1-4.3

Formation & geological history

Formed during regional metamorphism of mica schists or found in alluvial deposits (placer deposits) through weathering. Common in the Seongjusan area, which features metamorphic and igneous terrain.

Uses & applications

Used as an abrasive in industry (sandpaper, waterjet cutting), a gemstone in jewelry, and a geological indicator for metamorphism grade.

Geological facts

Garnets are the birthstone for January. The name 'Garnet' comes from the Latin 'granatus' (grain), possibly referring to pomegranate seeds which they resemble. Seongjusan is a known area for finding small alluvial mineral grains.

Field identification & locations

Identify by its characteristic dodecahedral shape, high density, and lack of cleavage (it breaks with a subconchoidal fracture). Small grains are often found in stream beds ('heavy sand').