gemstone
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
AI-generated identification · may be incorrectHardness: 6.5 - 7.5 on the Mohs scale, Color: Dark red, brownish-red, or nearly black, Luster: Vitreous to resinous, Crystal Structure: Isometric (cubic), Cleavage: None (conchoidal fracture), Specific Gravity: 3.9 - 4.3
- Hardness
- 6
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Physical properties
Hardness: 6.5 - 7.5 on the Mohs scale, Color: Dark red, brownish-red, or nearly black, Luster: Vitreous to resinous, Crystal Structure: Isometric (cubic), Cleavage: None (conchoidal fracture), 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
Used widely as a gemstone in jewelry, as an abrasive in waterjet cutting and sandblasting, and by mineral collectors.
Geological facts
Almandine is the most common and widespread species of the garnet group. Large, flawless specimens are often faceted into deep red gemstones known historically as carbuncles.
Field identification & locations
Can be identified by its deep red color, high specific gravity, lack of cleavage, and characteristic rounded crystal habit (dodecahedron or trapezohedron) often found embedded in metamorphic schists.
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