metamorphic
Schist
Metamorphic Rock (Schist)
Hardness varies from 3 to 5 on the Mohs scale depending on mineral composition, color ranges from silvery-gray to green or black, exhibits a prominent foliation known as schistosity with a sparkling or pearly luster due to aligned mica flakes, specific gravity around 2.7 to 3.0.
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Physical properties
Hardness varies from 3 to 5 on the Mohs scale depending on mineral composition, color ranges from silvery-gray to green or black, exhibits a prominent foliation known as schistosity with a sparkling or pearly luster due to aligned mica flakes, specific gravity around 2.7 to 3.0.
Formation & geological history
Formed through regional metamorphism of pelitic sedimentary rocks like shale or mudstone, or igneous rocks, under high temperature and pressure conditions over millions of years.
Uses & applications
Used locally as a decorative stone in landscaping, flagstone for walkways, and sometimes as a low-grade construction aggregate.
Geological facts
Schist is characterized by its strong foliation, meaning it splits easily into thin flakes or slabs due to the parallel alignment of platy minerals like biotite and muscovite.
Field identification & locations
Easily identified in the field by its distinct visible mineral flakes, sparkling appearance, and platy or foliated texture. Commonly found in old mountain belts and shield areas worldwide.
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