metamorphic

Likely biotite-rich schist

Mica schist, likely containing biotite and quartz; exact identification requires examination

AI-generated identification · may be incorrect

Dark gray-green, coarse and visibly flaky with a micaceous sheen and foliation. Mica is typically Mohs 2–3 and quartz 7; the specimen’s overall hardness and specific gravity cannot be determined from the image.

Identified October 5, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when mica-bearing sedimentary or igneous rocks undergo heat and pressure, aligning mica into foliation. Its age and precise formation environment cannot be determined from appearance alone.

Uses & applications

Commonly collected as a teaching or display specimen; schist may be used locally as decorative stone or aggregate, but mica-rich varieties are generally not prized for construction.

Geological facts

Schist is identified by visible platy minerals and a foliated texture; the image is consistent with this but cannot confirm its mineral composition.

Field identification & locations

Look for sparkly mica flakes and a tendency to split along wavy foliation; schist occurs in metamorphic belts worldwide. A hand lens and streak/hardness tests can help distinguish it from other dark rocks.