metamorphic
Garnet in Schist (Polished Tower)
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
Hardness: 6.5-7.5 (garnet), 2-3 (mica/schist matrix); Color: Deep burgundy-red to black garnets set in a silvery-grey to black foliated matrix; Luster: Vitreous to sub-adamantine garnets; Crystal structure: Isometric (garnets)
- Hardness
- 6
- Luster
- Vitreous to sub-adamantine garnets
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Physical properties
Hardness: 6.5-7.5 (garnet), 2-3 (mica/schist matrix); Color: Deep burgundy-red to black garnets set in a silvery-grey to black foliated matrix; Luster: Vitreous to sub-adamantine garnets; Crystal structure: Isometric (garnets)
Formation & geological history
Formed at high temperatures and pressures during regional metamorphism of clay-rich sedimentary rocks (shales). The garnets grow as porphyroblasts within the schist matrix.
Uses & applications
Used primarily as decorative ornamental pieces, crystal healing/metaphysical points, and paperweights. Industrial garnet is used as an abrasive.
Geological facts
Almandine garnet is the most common garnet and is often called the 'Gem of Enlightenment.' Large garnet crystals in schist are a classic indicator of medium-grade metamorphism.
Field identification & locations
Identify by the contrast between the hard, rounded garnet crystals and the flaky, foliated schist matrix. Commonly found in metamorphic terrains like the Alps, New England (USA), and India.
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