mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
AI-generated identification · may be incorrectHardness of 6.5-7.5 on the Mohs scale, deep red to brownish-black color, vitreous to resinous luster, and isometric crystal system typically forming dodecahedrons or trapezohedrons.
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Physical properties
Hardness of 6.5-7.5 on the Mohs scale, deep red to brownish-black color, vitreous to resinous luster, and isometric crystal system typically forming dodecahedrons or trapezohedrons.
Formation & geological history
Formed through regional metamorphism of aluminum-rich sedimentary rocks under high temperature and pressure, commonly found in schist and gneiss.
Uses & applications
Widely used as an abrasive in waterjet cutting, sandblasting, and as a semi-precious gemstone in jewelry.
Geological facts
Garnets have been used as gemstones since the Bronze Age and were popular signet rings in ancient Rome.
Field identification & locations
Identified by its characteristic dark red-brown color, high hardness, and distinct isometric crystal habit; commonly sourced from India, Brazil, and the USA.
