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, isometric crystal system, and distinct conchoidal fracture with no cleavage.
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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, isometric crystal system, and distinct conchoidal fracture with no cleavage.
Formation & geological history
Forms primarily in metamorphic rocks like schists and gneisses through regional metamorphism of aluminum-rich sedimentary rocks, as well as in certain igneous rocks like granitic pegmatites.
Uses & applications
Widely used as an abrasive in waterjet cutting and sandblasting, as well as a gemstone in jewelry when transparent and of sufficient quality.
Geological facts
Almandine is the most common and widespread member of the garnet group and was highly prized as a gemstone during Roman times.
Field identification & locations
Easily identified by its dark red-brown color, high hardness, and rounded isometric crystal habit or dodecahedral fragments; commonly found worldwide in metamorphic terranes and river placers.
