mineral

Garnet (Almandine)

Almandine Fe3Al2(SiO4)3

Hardness: 6.5-7.5. Color: Deep red to reddish-brown. Luster: Vitreous to resinous. Crystal structure: Isometric (dodecahedral). Cleavage: None (conchoidal fracture). Specific Gravity: 4.1-4.3.

Hardness: 6
Color: Deep red to reddish-brown
Luster: Vitreous to resinous

Identified June 7, 2026More mineral →

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Physical properties

Hardness: 6.5-7.5. Color: Deep red to reddish-brown. Luster: Vitreous to resinous. Crystal structure: Isometric (dodecahedral). Cleavage: None (conchoidal fracture). Specific Gravity: 4.1-4.3.

Formation & geological history

Formed primarily in regional metamorphic rocks such as mica schists and gneisses, as well as in some igneous rocks like granites and pegmatites. It forms under high temperature and pressure conditions.

Uses & applications

Commonly used as an abrasive in industrial applications (waterjet cutting, sandpaper), and as a popular gemstone in jewelry.

Geological facts

Garnet is the birthstone for January and has been used in jewelry since the Bronze Age. The name 'garnet' comes from the Latin word 'granatus' meaning grain or seed, possibly referring to pomegranate seeds.

Field identification & locations

Identified in the field by its distinct dodecahedral crystal habit, its high hardness, and its deep red color. Often found as isolated crystals in schist or as grains in heavy sand deposits.