metamorphic
Schist (Greenschist / Mica Schist)
Schist (variable mineral composition, commonly containing quartz, feldspar, mica, chlorite)
Hardness around 3.5 to 5.5 on the Mohs scale, grayish-green to silvery-grey color with a pearly to silky or sub-metallic luster. Shows prominent schistosicity (foliated layer structure) with visible platy mica or chlorite crystals.
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Physical properties
Hardness around 3.5 to 5.5 on the Mohs scale, grayish-green to silvery-grey color with a pearly to silky or sub-metallic luster. Shows prominent schistosicity (foliated layer structure) with visible platy mica or chlorite crystals.
Formation & geological history
Formed through regional metamorphism of shale, mudstone, or basaltic igneous rocks under intermediate heat and pressure. Commonly formed in collisional tectonic settings like mountain-building zones.
Uses & applications
Used historically as a decorative stone, flagstone for pathways, and low-grade dimension stone. Frequently collected as educational geological samples.
Geological facts
Schist gets its name from the Greek word 'schizein', meaning 'to split', referring to how easily the rock cleaves along parallel mica plates. It frequently hosts garnets or other porphyroblasts.
Field identification & locations
Look for a strong platy or flaky texture with visible mineral grains lined up in parallel planes. Common in glaciated riverbeds, mountainous terranes, and ancient metamorphic belts.
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