metamorphic

Muscovite schist

Mica schist, chiefly muscovite mica (KAl₂(AlSi₃O₁₀)(OH)₂) with quartz and feldspar

AI-generated identification · may be incorrect

Typically silver-gray, strongly foliated, and sparkly with platy mica; muscovite hardness is 2–2.5, quartz about 7. It has a micaceous luster, schistosity, and splits readily along aligned mica layers; the specimen may also contain rusty iron-oxide staining.

Identified August 16, 2026More metamorphic →

Explore 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 subjected to regional metamorphism, commonly during mountain building. Its age depends on locality, but such rocks are often Paleozoic to Precambrian.

Uses & applications

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

Geological facts

The glitter comes from light reflecting off millions of aligned muscovite flakes. Its pronounced foliation records directed pressure and elevated temperature during metamorphism.

Field identification & locations

Identify it by silvery sparkle, wavy layered texture, and flakes that peel or separate along foliation; quartz-rich bands and rusty weathering support the identification. Common in metamorphic mountain belts worldwide, including the Appalachians, New England, Scandinavia, and the Alps.