metamorphic

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

AI-generated identification · may be incorrect

Gray to silvery, sparkly appearance from platy mica; foliated texture, uneven fracture, and vitreous to pearly luster. Hardness is approximately 2–3 for mica and 6–7 for quartz; specific gravity about 2.7–3.0.

Identified September 11, 2026More metamorphic →

Explore Mica-rich metamorphic rock, likely schist in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed when shale or another clay-rich sediment is subjected to elevated temperature and pressure during regional metamorphism, commonly during mountain building. Its exact geological age cannot be determined from the image.

Uses & applications

Used locally as decorative stone, fill, or landscaping material; attractive mica-rich pieces may be collected, but this specimen is unlikely to have significant jewelry value.

Geological facts

The reflective flakes are probably muscovite (light-colored) and/or biotite (dark-colored), while gray granular areas may be quartz or feldspar. Mica flakes commonly separate into thin elastic sheets.

Field identification & locations

Identify it by visible foliation and abundant glittering mica flakes; individual mica sheets should peel along cleavage planes. Common in metamorphic mountain belts worldwide, including the Appalachians, Alps, Himalaya, and Canadian Shield.