metamorphic
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
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
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Physical properties
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
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.
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