metamorphic

Likely mica-rich schist

Mica schist, probably muscovite- or biotite-bearing; exact minerals cannot be confirmed from the photo

AI-generated identification · may be incorrect

Coarse, foliated, glittery gray-brown rock with visible platy mica; mica has Mohs hardness about 2–3, while associated quartz is 7. Schist lacks one fixed crystal structure or specific gravity because it is a rock composed of several minerals.

Identified October 6, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when clay-rich sedimentary rock was buried and recrystallized under heat and directed pressure; its age depends on the source region and cannot be determined visually.

Uses & applications

Schist is used as decorative stone, landscaping material, and occasionally building stone; mica-bearing specimens are mainly collected for their sparkle and foliation.

Geological facts

The reflective flakes are likely mica, whose sheets split readily into thin layers; schistosity is the alignment of these platy minerals during metamorphism.

Field identification & locations

Look for shiny, aligned flakes and a tendency to split along wavy layers; common in metamorphic belts worldwide. The photograph is insufficient to identify the exact mica or locality.