metamorphic
Schist (Micaceous Schist)
Mica Schist
Hardness: 3.5 to 5 on Mohs scale. Color: silvery-gray to brownish-gray with a distinct sparkly metallic luster from fine mica flakes. Foliated texture (schistosities) with parallel alignment of platy mineral grains.
- Hardness
- 3
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Physical properties
Hardness: 3.5 to 5 on Mohs scale. Color: silvery-gray to brownish-gray with a distinct sparkly metallic luster from fine mica flakes. Foliated texture (schistosities) with parallel alignment of platy mineral grains.
Formation & geological history
Formed through regional metamorphism of clay-rich sedimentary rocks (such as shale or mudstone) under moderate pressure and heat during mountain-building events.
Uses & applications
Historically used as dimension stone, flagstone, and decorative garden stone. Collectors value specimens with interesting foliation patterns or porphyroblasts.
Geological facts
The word schist comes from the Greek word 'schizein', meaning 'to split', referring to how easily the rock cleaves along parallel mica layers.
Field identification & locations
Look for visible alignment of mineral grains and a noticeable silvery sparkle when light catches the surface. Commonly found along riverbeds and erosion zones in metamorphic mountain belts.
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