metamorphic
Likely mica schist with garnet
Garnet-bearing mica schist, probably containing biotite/muscovite and almandine garnet
AI-generated identification · may be incorrectDark, strongly foliated, sparkly specimen with platy mica and a brown-red granular area consistent with garnet. Mica hardness is about 2–3; almandine garnet is 7–7.5 Mohs; the photo is insufficient to confirm the minerals or measure density.
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Physical properties
Dark, strongly foliated, sparkly specimen with platy mica and a brown-red granular area consistent with garnet. Mica hardness is about 2–3; almandine garnet is 7–7.5 Mohs; the photo is insufficient to confirm the minerals or measure density.
Formation & geological history
Formed when clay-rich sedimentary rock underwent regional metamorphism, producing aligned mica and possibly garnet. Its age cannot be determined from the image; such rocks occur in metamorphic belts of many ages.
Uses & applications
Primarily a teaching and collector specimen; mica-bearing schist has limited decorative or dimension-stone use.
Geological facts
Schistosity is the visible alignment of platy minerals; garnet commonly grows as crystals during metamorphism and may remain embedded in the mica-rich matrix.
Field identification & locations
Look for glittering, aligned mica flakes and a distinct hard, equant garnet grain; garnet resists scratching with a steel knife better than mica. Garnet schists occur worldwide in regions such as the Appalachians, Alps, and Scottish Highlands.
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