metamorphic

Mica-rich schist (likely muscovite schist)

Muscovite–quartz schist; chiefly muscovite mica, quartz, and minor feldspar/biotite

AI-generated identification · may be incorrect

Very coarse, strongly foliated and flaky, with silvery-white to gray mica, quartz-rich bands, and local rusty iron staining. Mica is Mohs 2–2.5 with perfect basal cleavage; quartz is Mohs 7, vitreous, and commonly gray-white; overall specific gravity is roughly 2.6–2.8.

Identified September 7, 2026More metamorphic →

Explore Mica-rich schist (likely muscovite 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 buried and subjected to elevated temperature and directed pressure, producing mica alignment and schistosity. Its precise age cannot be determined from the photograph; such rocks occur in Precambrian through younger metamorphic belts.

Uses & applications

Used locally as decorative stone, landscaping rock, fill, and occasionally roofing or wall material; attractive mica specimens are collected but are generally not gem material.

Geological facts

The glittering surface reflects thousands of aligned mica sheets, and the rock splits preferentially along foliation. Abundant mica and intense layering distinguish schist from massive granite or quartzite.

Field identification & locations

Identify it by its pronounced wavy foliation, platy cleavage, and sparkling flakes that can be peeled with a knife; common in mountain metamorphic terrains worldwide, including the Appalachians, New England, Scandinavia, and the Alps.