mineral

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Hardness: 6.5-7.5 on Mohs scale. Color: Deep dark red to reddish-black. Luster: Vitreous to sub-vitreous. Crystal Structure: Isometric/Cubic. Specific Gravity: 3.5-4.3.

Hardness: 6
Color: Deep dark red to reddish-black
Luster: Vitreous to sub-vitreous

Identified July 9, 2026More mineral →

Explore Garnet (Almandine) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7.5 on Mohs scale. Color: Deep dark red to reddish-black. Luster: Vitreous to sub-vitreous. Crystal Structure: Isometric/Cubic. Specific Gravity: 3.5-4.3.

Formation & geological history

Formed primarily in metamorphic rocks like mica schists, often as a result of regional metamorphism of clay-rich sedimentary rocks. They can also occur in some igneous rocks like granites.

Uses & applications

Commonly used as gemstones in jewelry, as an abrasive in sandblasting and waterjet cutting, and as a popular specimen for collectors.

Geological facts

Garnet is the birthstone for January. Almandine is the most common variety of the garnet group. The name comes from 'Alabanda', an ancient city in Asia Minor where these stones were traditionally cut.

Field identification & locations

Identified by its high density, deep red color (often appearing black until held to light), and lack of cleavage. Commonly found in India, Sri Lanka, Brazil, and the USA.