mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
AI-generated identification · may be incorrectHardness of 6.5-7.5 on Mohs scale, deep red to dark brownish-black color, vitreous to resinous luster, isometric crystal system with characteristic dodecahedral habit, and distinct conchoidal fracture with no true cleavage.
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Physical properties
Hardness of 6.5-7.5 on Mohs scale, deep red to dark brownish-black color, vitreous to resinous luster, isometric crystal system with characteristic dodecahedral habit, and distinct conchoidal fracture with no true cleavage.
Formation & geological history
Forms primarily in regional metamorphic rocks like schists and gneisses, as well as in certain igneous rocks like granitic pegmatites, through high-temperature and pressure crystallization.
Uses & applications
Widely used as an abrasive in waterjet cutting and sandblasting, as well as a semi-precious gemstone in jewelry.
Geological facts
Garnets have been used as gemstones since the Bronze Age and were popular in Victorian-era jewelry. Almandine is the most common species of the garnet group.
Field identification & locations
Easily identified in the field by its dark red color, high hardness, and typical rounded dodecahedral or trapezohedral crystal forms embedded in metamorphic host rocks.
