mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
AI-generated identification · may be incorrectHardness of 6.5 to 7.5 on the Mohs scale, deep red to brownish-black color, vitreous to resinous luster, and isometric crystal system.
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Physical properties
Hardness of 6.5 to 7.5 on the Mohs scale, deep red to brownish-black color, vitreous to resinous luster, and isometric crystal system.
Formation & geological history
Forms in metamorphic rocks like schist and gneiss through regional metamorphism of iron- and aluminum-rich sedimentary rocks.
Uses & applications
Used primarily as an abrasive in waterjet cutting and sandblasting, as well as a semi-precious gemstone in jewelry.
Geological facts
Almandine is the most common variety of garnet and is often found in blocky, rounded dodecahedron crystals known as crystal habits.
Field identification & locations
Identified by its dark red-brown hue, high hardness, and lack of cleavage; commonly found worldwide in metamorphic terranes and stream placers.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
Limonite
FeO(OH)•nH2O
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral