metamorphic
Likely weathered mica schist fragment
Mica schist, chiefly muscovite/biotite mica with quartz and feldspar
AI-generated identification · may be incorrectGray-silver, platy and strongly foliated, with a sparkly pearly luster and uneven fracture; individual mica flakes are Mohs 2–3, while quartz is 7. The specimen appears naturally weathered or hand-shaped, so exact composition is uncertain from the image.
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Physical properties
Gray-silver, platy and strongly foliated, with a sparkly pearly luster and uneven fracture; individual mica flakes are Mohs 2–3, while quartz is 7. The specimen appears naturally weathered or hand-shaped, so exact composition is uncertain from the image.
Formation & geological history
Formed when shale or another clay-rich sediment underwent regional metamorphism, typically during mountain building; its age depends on the source terrane and cannot be determined visually. Foliation developed as mica grains aligned under directed pressure and heat.
Uses & applications
Used locally as decorative stone, aggregate, landscaping material, and occasionally roofing or wall stone; attractive mica-rich pieces are mainly educational or collectible rather than high-value jewelry material.
Geological facts
The visible silvery sheen and layered, crumpled texture are characteristic of aligned mica. It may also be a mica-rich metamorphic mineral aggregate rather than a pure rock.
Field identification & locations
Look for thin layers that split along foliation, glittering mica flakes, and a relatively soft surface; a steel nail may scratch exposed mica. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, and Himalayas.
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