metamorphic
Mica Schist
Schist (biotite/muscovite schist)
Hardness 3.5-4, silvery-brown to dark bronze metallic sheen, pearly to sub-metallic luster, strongly foliated texture (schistosity), uneven fracture.
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Physical properties
Hardness 3.5-4, silvery-brown to dark bronze metallic sheen, pearly to sub-metallic luster, strongly foliated texture (schistosity), uneven fracture.
Formation & geological history
Formed by medium-grade regional metamorphism of shale, mudstone, or clay-rich sedimentary rocks under high temperature and directed pressure.
Uses & applications
Used historically as building stone, flagstone, and decorative landscaping rock. Sometimes mined as a source of mica or associated garnets.
Geological facts
The word schist comes from the Greek word 'schizein', meaning 'to split', referring to how easily the rock splits along parallel mineral layers.
Field identification & locations
Identified by its highly reflective mica flakes that sparkle in light and distinct wavy layer alignment. Commonly found in metamorphic terrains worldwide.
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