metamorphic
Garnet-bearing metamorphic rock
Likely garnet schist or garnet-bearing mica schist; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃
AI-generated identification · may be incorrectSmall, irregular dark reddish-brown specimen with reflective silvery mica and possible quartz. Garnet hardness is 6.5–7.5 Mohs, vitreous luster, cubic crystal structure, and no cleavage; mica is softer (2–3) with perfect sheet cleavage.
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Physical properties
Small, irregular dark reddish-brown specimen with reflective silvery mica and possible quartz. Garnet hardness is 6.5–7.5 Mohs, vitreous luster, cubic crystal structure, and no cleavage; mica is softer (2–3) with perfect sheet cleavage.
Formation & geological history
Likely formed when clay-rich sedimentary rock underwent medium-grade regional metamorphism, growing garnet during burial and heating. Such rocks commonly formed hundreds of millions to billions of years ago, depending on locality.
Uses & applications
Used mainly as a collectible or lapidary specimen; garnet is also an abrasive and gemstone, while schist has limited decorative and building use.
Geological facts
The red-brown grains are probably garnet porphyroblasts embedded in mica-rich foliation. A strong magnet may weakly attract iron-rich almandine.
Field identification & locations
Look for glittering parallel mica layers, flaky foliation, and hard red-brown garnet grains that resist scratching with steel. Common in metamorphic mountain belts worldwide, including India, Brazil, Madagascar, and the United States.
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