mineral
Garnet (Almandine)
Fe3Al2(SiO4)3
Hardness: 7-7.5, Color: Deep reddish-brown to dark burgundy, Luster: Vitreous to resinous, Crystal system: Isometric (dodecahedral habits), Cleavage: None (conchoidal fracture), Specific Gravity: 4.0-4.3
- Hardness
- 7-7
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Physical properties
Hardness: 7-7.5, Color: Deep reddish-brown to dark burgundy, Luster: Vitreous to resinous, Crystal system: Isometric (dodecahedral habits), Cleavage: None (conchoidal fracture), Specific Gravity: 4.0-4.3
Formation & geological history
Forms primarily during regional metamorphism of argillaceous rocks (clay-rich sediments) under high pressure and temperature conditions, commonly found in mica schists, gneisses, and amphibolites.
Uses & applications
Used widely as an industrial abrasive (waterjet cutting, sandpaper), gemstone in jewelry, and as an indicator mineral in geological exploration.
Geological facts
Garnets have been used as gemstones since the Bronze Age. The name 'garnet' comes from the Latin word 'granatus', meaning 'pomegranate', due to its resemblance to red pomegranate seeds.
Field identification & locations
Identified by its high hardness, rich reddish-brown color, dodecahedral crystal habits, and lack of cleavage. Common in metamorphic terrains worldwide including New York, Idaho, India, and Madagascar.
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