metamorphic

Likely muscovite-bearing mica schist

Mica schist, composed mainly of quartz and mica (muscovite and/or biotite)

AI-generated identification · may be incorrect

Small, irregular gray-green specimen with a shiny, flaky brown-gold surface. Mica has Mohs hardness about 2–3 and perfect basal cleavage; schist’s hardness varies with its mineral mix. The photo does not reveal enough detail for a firm identification.

Identified September 30, 2026More metamorphic →

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Physical properties

Formation & geological history

Schist forms when clay-rich sedimentary rock or shale is metamorphosed under heat and pressure, aligning mica into visible layers. Its age cannot be determined from the image.

Uses & applications

Mica is used in electrical and thermal insulation, while attractive schist specimens are collected or used decoratively.

Geological facts

The glinting surface may be reflective mica flakes, a common feature of schistose rocks.

Field identification & locations

Look for platy, sparkly minerals and a layered or foliated texture; schist occurs in metamorphic mountain belts worldwide. The specimen is too small and indistinct for confident field identification.