metamorphic
Possible weathered mica-rich metamorphic fragment
Mica schist or phyllite (quartz–mica assemblage; identification uncertain from image)
AI-generated identification · may be incorrectSmall, flattened, gray-brown specimen with silvery reflective flakes and layered/foliated texture. Likely Mohs hardness 2–7 depending on mica versus quartz; mica has perfect basal cleavage and pearly luster.
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Physical properties
Small, flattened, gray-brown specimen with silvery reflective flakes and layered/foliated texture. Likely Mohs hardness 2–7 depending on mica versus quartz; mica has perfect basal cleavage and pearly luster.
Formation & geological history
Likely formed when clay-rich sediment was buried, heated, and compressed during regional metamorphism, producing aligned mica layers; age depends on locality and cannot be determined visually.
Uses & applications
Usually a collector specimen; larger schist and phyllite are used locally for decorative stone, roofing, paving, and aggregate, though this piece is too small for practical use.
Geological facts
The glitter is probably mica, whose thin sheets can separate into flexible flakes. The rounded edges suggest transport or weathering rather than a fresh outcrop fragment.
Field identification & locations
Common in metamorphic belts worldwide, including the Appalachians, New England, the Alps, and Himalayan regions. Look for visible foliation, platy cleavage, and mica sparkle; a photo alone cannot exclude a mica-rich rock, mineral-coated pebble, or metallic slag.
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