mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
AI-generated identification · may be incorrectHardness: 7-7.5 (Mohs), Color: deep red to reddish-brown/black, Luster: Vitreous to resinous, Crystal Structure: Isometric, Fracture: Conchoidal to uneven, Specific Gravity: 4.1-4.3
- Hardness
- 7-7
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Physical properties
Hardness: 7-7.5 (Mohs), Color: deep red to reddish-brown/black, Luster: Vitreous to resinous, Crystal Structure: Isometric, Fracture: Conchoidal to uneven, Specific Gravity: 4.1-4.3
Formation & geological history
Primary formation occurs in metamorphic rocks like mica schists, resulting from the regional metamorphism of argillaceous sediments. It can also be found in some igneous rocks like granites.
Uses & applications
Commonly used as an abrasive in sandblasting and waterjet cutting; high-quality transparent specimens are used as gemstones in jewelry.
Geological facts
Almandine is the most common member of the garnet group. In ancient times, deep red garnets like this were often called 'carbuncles'. It is the birthstone for January.
Field identification & locations
Identified by its deep red color, high hardness, and heavy weight (specific gravity). Look for dodecahedral crystal faces. Common in metamorphic belts worldwide, such as in India, Brazil, and the USA.
More like this
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