mineral
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
AI-generated identification · may be incorrectHardness: 6.5-7.5. Color: Deep reddish-brown to black. Luster: Vitreous to resinous. Crystal Structure: Isometric/Cubic. Cleavage: None (conchoidal fracture). Specific Gravity: 3.5-4.3.
- Hardness
- 6
- Color
- Deep reddish-brown to black
- Luster
- Vitreous to resinous
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Physical properties
Hardness: 6.5-7.5. Color: Deep reddish-brown to black. Luster: Vitreous to resinous. Crystal Structure: Isometric/Cubic. Cleavage: None (conchoidal fracture). Specific Gravity: 3.5-4.3.
Formation & geological history
Formed in metamorphic rocks seperti schist and gneiss through high heat and pressure, as well as in some igneous rocks. These particular dark, rough fragments likely come from weathered metamorphic deposits.
Uses & applications
Used widely as abrasive (sandpaper, waterjet cutting), gemstones in jewelry, and geological indicators for metamorphic history.
Geological facts
Garnet is the January birthstone. It is unusual because it can act as a natural thermometer for geologists, helping them determine the pressure and temperature at which a rock formed.
Field identification & locations
Identify in the field by its high hardness (scratches glass), dodecahedral crystal habit (though these are fragments), and lack of cleavage. Common in many mountain ranges globally.
