metamorphic
Reddish-brown mica-rich schist (likely biotite schist)
Biotite schist; mica-rich metamorphic rock, commonly composed of biotite, quartz, and feldspar
AI-generated identification · may be incorrectRusty reddish-brown, reflective platy flakes and strong foliation; mica has Mohs hardness 2.5–3, while quartz grains are 7. The layered texture suggests schistosity; exact minerals cannot be confirmed from the image alone.
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Physical properties
Rusty reddish-brown, reflective platy flakes and strong foliation; mica has Mohs hardness 2.5–3, while quartz grains are 7. The layered texture suggests schistosity; exact minerals cannot be confirmed from the image alone.
Formation & geological history
Forms when clay-rich sedimentary or igneous rocks undergo heat and pressure, aligning mica into visible layers. Metamorphic age and setting cannot be determined from appearance alone.
Uses & applications
Mostly a decorative or teaching/collecting specimen; some schists are used as facing stone or landscaping material, though mica-rich varieties can split and weather easily.
Geological facts
The sheen comes from abundant sheet silicate minerals that reflect light from aligned surfaces.
Field identification & locations
Look for glittering, platy flakes and pronounced wavy layering; biotite schist occurs in metamorphic belts worldwide. A small common hand specimen typically sells for about $5–$25 USD.
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