Mineral

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Hardness: 6.5–7.5 Mohs scale; Color: Deep red, reddish-brown, or black; Luster: Vitreous to resinous; Crystal structure: Isometric (dodecahedral or trapezohedral); Cleavage: None (conchoidal fracture); Specific gravity: 4.1–4.3

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

Identified March 16, 2026More mineral →

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Physical properties

Formation & geological history

Formed through regional metamorphism of clay-rich sedimentary rocks (pelites) or in igneous rocks like pegmatites. This specific type of rough specimen often originates from metamorphic schists and can range significantly in age depending on the host rock, often from the Paleozoic or Precambrian eras.

Uses & applications

Commonly used as an abrasive in sandpaper and water-jet cutting. Gem-quality specimens are used in jewelry. In ancient times, it was used for carvings and signet rings.

Geological facts

Garnet is the official birthstone for January. The name 'Garnet' comes from the Latin word 'granatus', meaning seed-like, due to its resemblance to pomegranate seeds. Almandine is the most common member of the garnet mineral group.

Field identification & locations

Identify in the field by its characteristic 'soccer ball' shape (dodecahedron), high density (it feels heavy for its size), and deep red translucent flashes when held to light. Often found in metamorphic clusters within mica schist or as loose stones in stream beds.

Other mineral specimens

See all

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral