metamorphic
Mica Schist
Schist (Muscovite/Biotite Schist)
Hardness: 2-4 (Mohs), Color: Silver-grey to brownish-grey, Luster: Pearly to sub-metallic due to mica flakes, Structure: Foliated (schistosity), Cleavage: Perfect basal cleavage in individual mica grains.
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Physical properties
Hardness: 2-4 (Mohs), Color: Silver-grey to brownish-grey, Luster: Pearly to sub-metallic due to mica flakes, Structure: Foliated (schistosity), Cleavage: Perfect basal cleavage in individual mica grains.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high temperatures and pressures. This creates large, visible flakes of mica oriented in parallel layers.
Uses & applications
Mainly used as a decorative stone in landscaping, flagstones for pathways, and occasionally as a source of mica for electrical insulation or glitter-like pigments.
Geological facts
The word 'schist' is derived from the Greek word 'skhistos', meaning 'split', referring to the ease with which the rock can be split into thin slabs along its mica layers.
Field identification & locations
Identify in the field by its distinct 'sparkle' or 'glitter' when held in the sun, and its tendency to flake off into tiny shiny scales when scratched. Common in mountain ranges like the Appalachians or the Alps.
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