mineral

Garnet (likely Almandine)

Almandine (Fe3Al2(SiO4)3)

AI-generated identification · may be incorrect

Hardness: 6.5–7.5 on Mohs scale; Color: Deep red, brownish-red to black; Luster: Vitreous to resinous; Crystal structure: Isometric (often dodecahedral); Cleavage: Indistinct; Specific Gravity: 3.5–4.3

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

Identified March 16, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in metamorphic rocks like mica schists and gneisses through high pressure and temperature; can also be found in igneous rocks and as alluvial grains. These specimens can range from millions to over a billion years old.

Uses & applications

Commonly used as an abrasive in sandblasting and water-jet cutting; transparent, high-quality stones are used as gemstones in jewelry; also a popular mineral for student and entry-level collections.

Geological facts

Garnet is the birthstone for January. Almandine is the most common variety of the garnet group. Some garnets exhibit a star effect (asterism) due to rutile inclusions.

Field identification & locations

Identify by its 'soccer ball' shape (12-sided dodecahedron) and deep reddish-brown color. Frequently found in mica schists in the Northeastern US, India, Brazil, and Madagascar. Collectors should look for sharp crystal faces and translucency.