metamorphic

Weathered metamorphic rock, likely quartz-mica schist

Quartz–mica schist; composition typically quartz + muscovite/biotite ± feldspar

AI-generated identification · may be incorrect

Hardness about 2–7 depending on minerals; gray-brown, weathered surface, with reflective mica flecks and possible foliation. Quartz gives vitreous luster and conchoidal fracture, while mica forms platy cleavage; specific gravity commonly 2.6–2.8.

Identified September 7, 2026More metamorphic →

Explore Weathered metamorphic rock, likely quartz-mica 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 other clay-rich sediment was subjected to regional heat and pressure, producing aligned mica and recrystallized quartz. Its precise geological age cannot be determined from the photograph and depends on the local bedrock.

Uses & applications

Used locally as dimension stone, landscaping rock, aggregate, or decorative slabs; attractive mica-rich pieces may be collected but are generally low-value.

Geological facts

The irregular light and dark bands and glittery flakes are consistent with metamorphic foliation, though the image alone cannot exclude weathered gneiss or altered granite.

Field identification & locations

Look for planar foliation, mica sparkle, and layers that split along aligned minerals; common in regional metamorphic belts worldwide. A fresh broken surface and hardness/acid tests would improve identification.