metamorphic

Mica schist (likely biotite–muscovite schist)

Mica schist; chiefly quartz and mica minerals (muscovite KAl₂(AlSi₃O₁₀)(OH)₂ and/or biotite)

AI-generated identification · may be incorrect

Small gray, silvery, flaky specimen with visible reflective mica and foliated texture. Mica has Mohs hardness 2–3 and perfect basal cleavage; quartz, if present, is harder (7). Exact composition cannot be confirmed from the photo.

Identified September 28, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when clay-rich sedimentary or igneous rocks undergo regional metamorphism, aligning mica into foliation; age depends on its source locality and cannot be determined visually.

Uses & applications

Mostly collected as a teaching or display specimen; mica has industrial uses as an electrical and thermal insulator, though this small piece has no practical industrial value.

Geological facts

Schistosity is the pronounced layering produced by aligned platy minerals under heat and pressure.

Field identification & locations

Look for glittering mica flakes and a tendency to split along wavy, roughly parallel layers. Schist occurs in metamorphic belts worldwide; locality details or testing would be needed for a secure identification.