mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
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
- 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.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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
Granite
Granite (Phaneritic intrusive igneous rock)
igneous