metamorphic
Mica schist
Schist dominated by muscovite/biotite mica, commonly with quartz and feldspar
AI-generated identification · may be incorrectTypically silver-gray to brown, with a strongly foliated texture and abundant reflective mica flakes; hardness about 2–3 for mica and 6–7 for quartz, with excellent mica cleavage and a sparkly vitreous to pearly luster.
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Physical properties
Typically silver-gray to brown, with a strongly foliated texture and abundant reflective mica flakes; hardness about 2–3 for mica and 6–7 for quartz, with excellent mica cleavage and a sparkly vitreous to pearly luster.
Formation & geological history
Formed when shale or another clay-rich sediment was subjected to regional metamorphism, causing minerals to recrystallize and align under heat and pressure; commonly Paleozoic or older, depending on the terrane.
Uses & applications
Used locally as decorative stone, landscaping material, and occasionally dimension stone, though its foliation makes it prone to splitting; attractive specimens are collected for their glittering texture.
Geological facts
The prominent layering is schistosity, produced by aligned platy mica minerals. Rust-colored streaks likely reflect weathering of iron-bearing biotite or sulfide minerals.
Field identification & locations
Identify it by easily visible mica flakes, glittering surfaces, and layers that split roughly parallel to foliation; common in mountain belts and metamorphic terrains worldwide. A geologic test for exact identification may require thin-section or mineral analysis.
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