metamorphic
Garnet Schist
Almandine Garnet in Micaceous Schist
Hardness: 6.5-7.5 (garnets) vs 2-3 (mica matrix); Color: Gray to white matrix with reddish-brown garnet inclusions; Luster: Pearly to sub-metallic matrix with vitreous garnets; Structure: Foliated matrix with isometric crystals
- Hardness
- 6
- Color
- Gray to white matrix with reddish-brown garnet inclusions
- Luster
- Pearly to sub-metallic matrix with vitreous garnets
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Physical properties
Hardness: 6.5-7.5 (garnets) vs 2-3 (mica matrix); Color: Gray to white matrix with reddish-brown garnet inclusions; Luster: Pearly to sub-metallic matrix with vitreous garnets; Structure: Foliated matrix with isometric crystals
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under high temperature and pressure conditions, typically during mountain-building events (orogeny).
Uses & applications
Mainly used as a geological study specimen; garnets are used as abrasives in waterjet cutting and sandblasting, or occasionally as low-grade gemstones.
Geological facts
The garnets in schist are often 'porphyroblasts,' meaning they grew larger than the surrounding minerals by absorbing the elements of the original rock as it metamorphosed.
Field identification & locations
Identify by finding a shimmering, flaky, or layered matrix containing red or brown circular or dodecahedral crystals. Found globally in metamorphic belts such as the Appalachians or Alps.
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