metamorphic
Garnet in Schist (Garnetiferous Micaceous Schist)
Almandine Garnet, Fe3Al2(SiO4)3
Hardness: 6.5-7.5 (garnet), 2-3 (mica matrix). Color: Deep red to brownish-red crystals in a silvery-tan sheen. Luster: Vitreous to sub-vitreous garnet; pearly matrix. Crystal system: Isometric dodecahedral garnets.
- Hardness
- 6
- Color
- Deep red to brownish-red crystals in a silvery-tan sheen
- Luster
- Vitreous to sub-vitreous garnet
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Physical properties
Hardness: 6.5-7.5 (garnet), 2-3 (mica matrix). Color: Deep red to brownish-red crystals in a silvery-tan sheen. Luster: Vitreous to sub-vitreous garnet; pearly matrix. Crystal system: Isometric dodecahedral garnets.
Formation & geological history
Formed through regional metamorphism of clay-rich sedimentary rocks (pelites) under high pressure and temperature conditions. Typically found in mica schists of various geological ages.
Uses & applications
Garnets are used as abrasives (sandpaper, waterjet cutting) and as gemstones if clear. The rock itself is a common specimen for educational geological collections.
Geological facts
Garnets are known as 'index minerals,' helping geologists determine the temperature and pressure history of the mountain range where they formed.
Field identification & locations
Identify by looking for hard, isometric (round/12-sided) red crystals embedded within a flaky, flaky-shiny micaceous matrix. Frequently found in the Appalachian or Alpine mountain belts.
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