gemstone
Garnet
Almandine Garnet (Fe3Al2(SiO4)3)
AI-generated identification · may be incorrectHardness of 6.5 to 7.5 on the Mohs scale, deep red to brownish-red color, vitreous luster, isometric crystal system, and no cleavage.
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Physical properties
Hardness of 6.5 to 7.5 on the Mohs scale, deep red to brownish-red color, vitreous luster, isometric crystal system, and no cleavage.
Formation & geological history
Forms primarily in metamorphic rocks like schist and gneiss through regional metamorphism under high temperature and pressure.
Uses & applications
Widely used as a precious gemstone in jewelry and in industrial applications like abrasive waterjet cutting and sandblasting.
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 distinctive deep red color, high refractive index, and isometric crystal habit; found globally in India, Brazil, and the USA.
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