mineral
Almandine Garnet
Fe3Al2(SiO4)3
AI-generated identification · may be incorrectHardness of 7.5 on the Mohs scale, deep red to brownish-black color, vitreous to resinous luster, and isometric crystal system typically forming rounded 12-sided dodecahedrons.
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Physical properties
Hardness of 7.5 on the Mohs scale, deep red to brownish-black color, vitreous to resinous luster, and isometric crystal system typically forming rounded 12-sided dodecahedrons.
Formation & geological history
Formed through regional metamorphism of aluminum-rich sedimentary protoliths in schist and gneiss, as well as in certain igneous intrusive rocks like pegmatites.
Uses & applications
Widely used as a semi-precious gemstone in jewelry and as an industrial abrasive in waterjet cutting and sandblasting.
Geological facts
Almandine is the most common and widely distributed member of the garnet group, deriving its name from Alabanda, an ancient Anatolian gemstone cutting center.
Field identification & locations
Identified by its characteristic dark red color, high hardness, lack of cleavage, and typical rounded crystal habit; commonly found worldwide in metamorphic terranes and stream placers.
