mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
AI-generated identification · may be incorrectHardness of 7.5 to 8 on the Mohs scale, deep red to brownish-black color, vitreous to resinous luster, and typically forms isometric dodecahedral or trapezohedral crystals.
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Physical properties
Hardness of 7.5 to 8 on the Mohs scale, deep red to brownish-black color, vitreous to resinous luster, and typically forms isometric dodecahedral or trapezohedral crystals.
Formation & geological history
Forms in metamorphic rocks like schists and gneisses through regional metamorphism, as well as in igneous rocks like granitic pegmatites.
Uses & applications
Widely used as an abrasive in waterjet cutting, sandblasting, and as a semi-precious gemstone in jewelry.
Geological facts
Almandine is the most common and widespread variety of garnet, often found as well-developed rounded crystal nodules called pebbles or macro-crystals.
Field identification & locations
Identified by its high hardness, characteristic dark red-brown hue, and distinct isometric crystal habit; commonly found worldwide in metamorphic terranes.
