metamorphic
Schist (likely Mica Schist)
Mica Schist
Hardness varies (4-6 on Mohs scale), earthy brown to golden-bronze color, sub-metallic to vitreous/pearly luster, highly foliated and flaky texture, perfect basal cleavage along mica flakes.
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Physical properties
Hardness varies (4-6 on Mohs scale), earthy brown to golden-bronze color, sub-metallic to vitreous/pearly luster, highly foliated and flaky texture, perfect basal cleavage along mica flakes.
Formation & geological history
Formed by regional metamorphism of shale or mudstone under medium-grade temperatures and pressures (typically 300–450°C). Platy minerals like biotite and muscovite align perpendicular to the direction of pressure.
Uses & applications
Used historically as building stones, flagstone, and decorative garden rock. Mineralogically significant as a source rock for metamorphic study.
Geological facts
Schist comes from the Greek word 'schizein' meaning 'to split', referring to how easily the rock parts along parallel mineral layers.
Field identification & locations
Identify in the field by its distinct layered, glittery, or flaky appearance (schistosity). Common in mountainous regions undergoing mountain-building events (orogenies).
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