metamorphic

Mica-rich rock fragment (likely biotite schist or mica schist)

Mica schist; likely dominated by biotite mica, with possible quartz and feldspar

AI-generated identification · may be incorrect

The small brown-gold fragment shows reflective, platy layers typical of mica. Mica has Mohs hardness about 2–3 and perfect basal cleavage; the rock’s exact composition and properties cannot be confirmed from the image alone.

Identified September 26, 2026More metamorphic →

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Physical properties

Formation & geological history

Schist forms when clay-rich or otherwise fine-grained rocks are recrystallized under heat and directed pressure during regional metamorphism. Its age and specific formation setting cannot be determined visually.

Uses & applications

Mica schist is used as decorative stone and occasionally in landscaping or building stone; mica itself has industrial uses in insulation and fillers. This small fragment is mainly a teaching or collector specimen.

Geological facts

Mica’s sheet-like cleavage lets it split into thin flakes. The golden sheen may be weathered biotite or another mica, rather than gold.

Field identification & locations

Look for a foliated texture and shiny flakes that separate into thin sheets; mica schist occurs in metamorphic belts worldwide. The image is insufficient for a definitive identification.