mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
AI-generated identification · may be incorrectHardness: 6.5-7.5 (Mohs scale), Color: Deep red to reddish-brown, Luster: Vitreous to resinous, Crystal Structure: Isometric (often dodecahedral), Cleavage: None (conchoidal fracture), Specific Gravity: 3.5-4.3
- 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 (often dodecahedral), Cleavage: None (conchoidal fracture), Specific Gravity: 3.5-4.3
Formation & geological history
Formed primarily during regional metamorphism of clay-rich sedimentary rocks like shale, creating mica schists. They can also occur in igneous rocks such as pegmatites. Found in metamorphic belts globally.
Uses & applications
Commonly used as an abrasive in sandblasting and waterjet cutting, as a filtration medium, and as a gemstone in jewelry. Collector specimens are highly valued for their crystal symmetry.
Geological facts
Garnets have been used as gemstones since the Bronze Age. The name comes from the Latin word 'granatus' meaning grain or seed, likely referring to its resemblance to pomegranate seeds.
Field identification & locations
Identify in the field by its characteristic 12-sided (dodecahedral) shape, high hardness (scratches glass), and dark red color. Often found embedded in silvery mica schist. Common in places like New York (USA), India, and Brazil.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous