metamorphic
Schist
Metamorphic Rock (Schist)
Hardness varies from 3 to 6 on the Mohs scale depending on mineral content, color ranges from grey to green with distinct reddish-brown iron oxide staining, luster is typically pearly or glossy due to mica content, foliated crystal structure with visible platy minerals aligned in parallel bands.
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Physical properties
Hardness varies from 3 to 6 on the Mohs scale depending on mineral content, color ranges from grey to green with distinct reddish-brown iron oxide staining, luster is typically pearly or glossy due to mica content, foliated crystal structure with visible platy minerals aligned in parallel bands.
Formation & geological history
Formed through regional metamorphism of pelitic sedimentary rocks like shale or mudstone, or sometimes igneous rocks, under high temperature and pressure conditions over millions of years.
Uses & applications
Used locally as decorative stone, crushed stone for landscaping, and occasionally in construction or road building.
Geological facts
Schist is characterized by its foliation, known as schistosity, which allows the rock to split easily into thin flakes or slabs due to the parallel alignment of sheet silicate minerals like micas.
Field identification & locations
Easily identified in the field by its pronounced foliation and the sparkly appearance of mica flakes on its cleavage surfaces. Commonly found in mountain-building belts and ancient continental shields worldwide.
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