mineral
Brown Garnet
Andradite or Almandine Garnet (general formula X3Y2(SiO4)3)
Hardness: 6.5-7.5 on Mohs scale; Color: Reddish-brown to dark brown; Luster: Vitreous to resinous; Crystal structure: Isometric (dodecahedral); Specific gravity: 3.6-4.3; Cleavage: None/Indistinct.
- Hardness
- 6
- Color
- Reddish-brown to dark brown
- Luster
- Vitreous to resinous
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Physical properties
Hardness: 6.5-7.5 on Mohs scale; Color: Reddish-brown to dark brown; Luster: Vitreous to resinous; Crystal structure: Isometric (dodecahedral); Specific gravity: 3.6-4.3; Cleavage: None/Indistinct.
Formation & geological history
Typically forms in metamorphic rocks like schist or gneiss through high pressure and temperature, or in contact metamorphic environments such as skarns.
Uses & applications
Used as an abrasive in sandblasting and water-jet cutting, and as a semi-precious gemstone in jewelry or for metaphysical collections.
Geological facts
Garnets have been used as gemstones and abrasives since the Bronze Age. They are the birthstone for January and are known for their extreme durability and lack of cleavage.
Field identification & locations
Identified by its characteristic dodecahedral shape (even when weathered), high hardness, and reddish-brown color. Common in metamorphic terrains globally.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock