metamorphic
Garnet Schist
Almandine Garnet in Mica Schist
Hardness: 6.5-7.5 (garnets), 2-3 (mica host); Color: reddish-brown crystals in a silver-grey or tan matrix; Luster: vitreous to pearly; Crystal structure: Isometric (garnet) and Monoclinic (mica); Cleavage: none in garnet, perfect basal in mica.
- Hardness
- 6
- Color
- reddish-brown crystals in a silver-grey or tan matrix
- Luster
- vitreous to pearly
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Physical properties
Hardness: 6.5-7.5 (garnets), 2-3 (mica host); Color: reddish-brown crystals in a silver-grey or tan matrix; Luster: vitreous to pearly; Crystal structure: Isometric (garnet) and Monoclinic (mica); Cleavage: none in garnet, perfect basal in mica.
Formation & geological history
Formed through regional metamorphism of clay-rich sedimentary rocks (pelites) under high temperature and pressure conditions, typically during mountain-building events.
Uses & applications
Garnets are used as industrial abrasives, in water-jet cutting, and as semi-precious gemstones. Schist is sometimes used as decorative stone or in garden construction.
Geological facts
Garnets are index minerals used by geologists to determine the metamorphic grade of a rock. This specimen shows a distinct garnet-rich layer or vein within the schist matrix.
Field identification & locations
Identify by looking for flat, plate-like mica grains that create a 'schistose' foliation, punctuated by hard, round, dark red or brown garnet dodecahedrons. Found in metamorphic terranes like the Appalachians, Alps, and Himalayas.
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