metamorphic

Muscovite-rich mica schist

Mica schist, chiefly muscovite [KAl₂(AlSi₃O₁₀)(OH)₂], possibly with quartz and feldspar

AI-generated identification · may be incorrect

Pale silvery-gray, sparkly, and strongly foliated with flaky, reflective sheets. Muscovite has Mohs hardness 2–2.5 and perfect basal cleavage; the rock’s hardness varies with its other minerals.

Identified October 13, 2026More metamorphic →

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Physical properties

Pale silvery-gray, sparkly, and strongly foliated with flaky, reflective sheets. Muscovite has Mohs hardness 2–2.5 and perfect basal cleavage; the rock’s hardness varies with its other minerals.

Formation & geological history

Likely formed when clay-rich sediment was metamorphosed by heat and pressure, aligning mica into layers. Its age cannot be determined from the image; mica schists occur in metamorphic belts of many ages.

Uses & applications

Mica is used in electrical and thermal insulation and cosmetics; schist is mainly a decorative or educational specimen and is not generally used as structural stone.

Geological facts

The visible shimmer and platy texture are characteristic of abundant mica, though the image alone cannot confirm the exact mineral mix.

Field identification & locations

Look for glittering flakes and a layered texture; distinguish it from a single mica crystal by its mixed, interlocking grains. Mica schist occurs worldwide in regions of regional metamorphism.