metamorphic

Garnet Schist

Almandine Garnet in Mica Schist

AI-generated identification · may be incorrect

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

Identified June 20, 2026More metamorphic →

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Physical properties

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.