metamorphic

Biotite–muscovite schist (mica schist)

Mica schist, likely quartz–feldspar–biotite ± muscovite; exact minerals cannot be confirmed from the photo

AI-generated identification · may be incorrect

Coarse, shiny, flaky foliation with abundant dark and silvery mica and lighter quartz/feldspar grains. Mica hardness is about 2–3 Mohs and quartz about 7; schist has no single crystal structure or specific gravity.

Identified October 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when mica-rich sedimentary or igneous rock was recrystallized and foliated by heat and pressure during regional metamorphism. The photo alone cannot establish its age.

Uses & applications

Mostly a collecting specimen or decorative stone; some schist is used as facing stone or aggregate, though mica-rich varieties split and weather readily.

Geological facts

Its glitter comes from reflective mica flakes aligned along the foliation. The coarse, platy texture is characteristic of schist.

Field identification & locations

Look for visible mica flakes and a tendency to split along wavy, parallel layers; this appears consistent with mica schist. The reported northern New Mexico location is geologically plausible, but a photo cannot verify provenance or distinguish it confidently from a mica-rich gneiss.