metamorphic
Likely biotite-rich schist
Mica schist, probably biotite-rich; exact identification requires close examination
AI-generated identification · may be incorrectDark gray-brown, visibly shiny and flaky with a foliated texture, consistent with mica. Biotite has Mohs hardness 2.5–3; the specimen’s hardness, cleavage, and density cannot be established from the image.
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Physical properties
Dark gray-brown, visibly shiny and flaky with a foliated texture, consistent with mica. Biotite has Mohs hardness 2.5–3; the specimen’s hardness, cleavage, and density cannot be established from the image.
Formation & geological history
Forms when clay-rich or other mica-bearing rocks undergo heat and pressure, aligning mica into layers. Its age and precise formation environment cannot be determined from appearance alone.
Uses & applications
Schist is used locally as building or landscaping stone; attractive mica-rich pieces may be collected, but this small rough specimen has little practical value.
Geological facts
The sparkling, layered appearance is characteristic of mica-bearing metamorphic rocks, though other minerals or rock types could look similar at this scale.
Field identification & locations
Look for platy, reflective grains and aligned layers; schists occur in metamorphic mountain belts worldwide. Estimated value: about $1–$10 as a common small specimen.
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