mineral

Almandine Garnet (weathered)

Almandine (Fe3Al2(SiO4)3)

Hardness: 6.5–7.5 on Mohs scale. Color: Deep reddish-brown to brownish-orange (due to iron oxidation). Luster: Vitreous to resinous. Crystal structure: Isometric (often dodecahedral). Cleavage: None (exhibits conchoidal fracture). Specific gravity: 4.1–4.3.

Hardness: 6
Luster: Vitreous to resinous

Identified March 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed during regional metamorphism of clay-rich sedimentary rocks (pelites) typically within mica schists or gneisses. This specimen shows heavy weathering and iron staining, suggesting it was found in an alluvial deposit or surface soil.

Uses & applications

Hard varieties are used as industrial abrasives (sandpaper, waterjet cutting). Clear, well-formed crystals are used in jewelry. Collectible as complex mineral specimens.

Geological facts

Almandine is the most common member of the garnet group. It has been used since Ancient Roman times as a gemstone and was frequently carved into intaglios and cameos.

Field identification & locations

Identify in the field by its characteristic 'ball-like' or 12-sided crystal shape (dodecahedron), extreme hardness, and high density (feels heavy for its size). Commonly found in the metamorphic belts of the Appalachian Mountains, India, and Brazil.

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