mineral
Red Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
Hardness: 6.5-7.5 (Mohs scale), 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
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Physical properties
Hardness: 6.5-7.5 (Mohs scale), 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 metamorphic rocks like mica schists, resulting from high-pressure and high-temperature metamorphism of clay-rich sediments. Found globally in Precambrian to Cenozoic geological settings.
Uses & applications
Commonly used as a gemstone in jewelry, as an abrasive in sandblasting and water-jet cutting, and as a filter medium in water filtration systems.
Geological facts
Almandine is the most common member of the garnet group. It is sometimes called 'Carbuncle' in ancient texts. It is the birthstone for January and is known for its magnetic properties due to high iron content.
Field identification & locations
Identify by its deep red translucency when backlit, dodecahedral crystal habits, and high hardness. Commonly found in metamorphic terrains in places like India, Brazil, and the USA.
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