metamorphic
Mica Schist
Mica Schist (contains muscovite/biotite, quartz, plagioclase)
Hardness 3.5-4 (varies depending on mineral mix); Pearly to vitreous luster; Silvery-grey to greenish-grey with strong reflective glitter; Foliated texture with visible parallel alignment of mica flakes.
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Physical properties
Hardness 3.5-4 (varies depending on mineral mix); Pearly to vitreous luster; Silvery-grey to greenish-grey with strong reflective glitter; Foliated texture with visible parallel alignment of mica flakes.
Formation & geological history
Formed through medium-grade regional metamorphism of clay-rich sedimentary rocks (like shale or mudstone) under moderate to high temperatures and pressures within collisional tectonic zones.
Uses & applications
Used primarily as decorative dimension stone, flagstone, landscape rock, and historically in building construction. Highly prized by collectors for its sparkling appearance.
Geological facts
Schist is characterized by schistosity, a texture caused by the preferred orientation of platy minerals such as mica, which causes the rock to split easily along thin layers.
Field identification & locations
Identify in the field by its distinct shiny, sparkling metallic surface caused by abundant aligned mica flakes. Commonly found in metamorphic terranes worldwide, including the Appalachian Mountains, Alps, and Scottish Highlands.
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