metamorphic

Muscovite Mica Schist

Metamorphic Rock (Muscovite-Biotite Schist)

AI-generated identification · may be incorrect

Hardness: 2-2.5 for mica flakes; Color: Silver, gray, and black with pearly to metallic luster; Crystal structure: Monoclinic (mica components); Cleavage: Perfect basal cleavage in thin sheets; Specific gravity: 2.7-2.9

Hardness: 2-2
Color: Silver, gray, and black with pearly to metallic luster

Identified July 29, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed through regional metamorphism of pelitic sedimentary rocks like shale or mudstone under moderate to high temperatures and pressures.

Uses & applications

Used in industrial applications for electrical insulation, drywall joint compounds, paint fillers, and as a mineral specimen for collectors.

Geological facts

Schist is characterized by its foliation, meaning the mineral grains are strongly aligned in parallel bands, giving the rock a scaly or flaky appearance.

Field identification & locations

Easily identified by its shiny, reflective flakes of mica visible on the rock's surface. Commonly found in mountain-building belts and old continental shields worldwide.