metamorphic
Rounded, foliated metamorphic pebble (likely schist)
Mica schist, composition uncertain from the image
AI-generated identification · may be incorrectGray-brown with silvery sheen and visible wavy foliation; likely quartz and mica, possibly feldspar. Mica is Mohs 2–3 and quartz 7; the mixed rock has no single hardness or specific gravity. Individual mica crystals are monoclinic; quartz is trigonal.
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Physical properties
Gray-brown with silvery sheen and visible wavy foliation; likely quartz and mica, possibly feldspar. Mica is Mohs 2–3 and quartz 7; the mixed rock has no single hardness or specific gravity. Individual mica crystals are monoclinic; quartz is trigonal.
Formation & geological history
Formed when clay-rich or other sedimentary rock was buried, heated, and compressed, aligning mica into layers. Its geological age and source cannot be determined from the photograph.
Uses & applications
Schist is used locally as building or landscaping stone; this small rounded pebble is mainly suitable for collecting or display.
Geological facts
The shiny streaks and layered texture suggest mica-rich foliation, but a photograph cannot confirm the rock type or mineral composition.
Field identification & locations
Look for parallel, wavy layers and reflective flakes; a fresh surface and simple hardness tests can help distinguish schist from other foliated rocks. Schist occurs in metamorphic belts worldwide.
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