metamorphic
Schist
Schist
Medium-grade metamorphic rock with significant foliation. Hardness depends on minerals present but usually around 4-5 on Mohs scale. Colors range widely from silver, grey, brown to black depending on mica and graphite content. Has a sparkly luster due to aligned mica flakes. Shows evident schistosity (foliation).
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Physical properties
Medium-grade metamorphic rock with significant foliation. Hardness depends on minerals present but usually around 4-5 on Mohs scale. Colors range widely from silver, grey, brown to black depending on mica and graphite content. Has a sparkly luster due to aligned mica flakes. Shows evident schistosity (foliation).
Formation & geological history
Formed from regional metamorphism of mudstone/shale or some types of igneous rocks under medium-high temperature and pressure conditions. Typically found in mountain belt regions from continental collisions.
Uses & applications
Often used as a decorative building stone, in landscaping, and sometimes as a source for garnet or other minerals if present.
Geological facts
Schist is characterized by its schistosity, the parallel arrangement of platy minerals, which causes the rock to break into thin flakes or slabs.
Field identification & locations
Identified by its strong foliation and visible, often sparkly, platy minerals like mica. Commonly found in areas with severe regional metamorphism. Collectors look for pieces with large accessory minerals like garnets.
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