gemstone
Almandine Garnet
Fe3Al2(SiO4)3
AI-generated identification · may be incorrectHardness: 6.5-7.5 on Mohs scale, Color: Dark red to brownish-red or purplish-red, Luster: Vitreous to resinous, Crystal Structure: Isometric (cubic), Cleavage: None (distinct parting sometimes present), Specific Gravity: 3.9-4.3
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.5 on Mohs scale, Color: Dark red to brownish-red or purplish-red, Luster: Vitreous to resinous, Crystal Structure: Isometric (cubic), Cleavage: None (distinct parting sometimes present), Specific Gravity: 3.9-4.3
Formation & geological history
Forms in metamorphic rocks such as mica schists and gneisses via regional metamorphism, as well as in certain igneous rocks like granitic pegmatites.
Uses & applications
Widely used in fine jewelry as a faceted gemstone, as well as in industrial applications such as waterjet cutting and abrasive sandblasting.
Geological facts
Garnets have been used as gemstones since the Bronze Age. Almandine is the most common and widely distributed of the garnet group minerals.
Field identification & locations
Identified by its characteristic deep red to purplish color, high refractive index, isometric crystal habit (often dodecahedral when rough), and lack of cleavage. Found worldwide including India, Brazil, and the USA.
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