gemstone

Almandine Garnet

Fe3Al2(SiO4)3

Hardness: 6.5-7.5 on the Mohs scale; Color: Deep red, brownish-red, or purplish-red; Luster: Vitreous to resinous; Crystal Structure: Isometric (cubic); Cleavage: None, exhibits distinct conchoidal fracture; Specific Gravity: 3.9-4.3

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

Identified August 3, 2026More gemstone →

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Physical properties

Formation & geological history

Forms in metamorphic rocks such as schists and gneisses through regional metamorphism, as well as in some igneous rocks like granitic pegmatites.

Uses & applications

Widely used in jewelry (facetted or cabochon gemstones set in rings and pendants), abrasive blasting, and waterjet cutting.

Geological facts

Almandine is the most common and widespread of the garnet group. Its name is derived from Alabanda, an ancient town in Asia Minor where these stones were once cut and traded.

Field identification & locations

Can be identified by its characteristic deep red-to-purple color, high specific gravity, and lack of cleavage. Often found globally, with notable deposits in India, Sri Lanka, Brazil, and the USA.