mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
Hardness of 6.5-7.5 on the Mohs scale, deep red to brownish-red or black color, vitreous to resinous luster, isometric crystal system with often dodecahedral or trapezohedral habits, indistinct cleavage, specific gravity around 3.9-4.3.
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Physical properties
Hardness of 6.5-7.5 on the Mohs scale, deep red to brownish-red or black color, vitreous to resinous luster, isometric crystal system with often dodecahedral or trapezohedral habits, indistinct cleavage, specific gravity around 3.9-4.3.
Formation & geological history
Forms primarily in metamorphic rocks like mica schists and gneisses via regional metamorphism of argillaceous sediments, as well as in certain igneous rocks like granitic pegmatites.
Uses & applications
Used as a gemstone in jewelry, as an industrial abrasive for sandblasting and waterjet cutting, and prized by mineral collectors.
Geological facts
Almandine is the most common and widely distributed species of the garnet group. Its name is derived from Alabanda, an ancient town in Asia Minor where garnets were cut and traded.
Field identification & locations
Identified by its dark reddish-brown color, high hardness, lack of cleavage, and typical rounded crystal shapes or fragments. Found worldwide including in the USA, India, Brazil, and Austria.
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