metamorphic
Mica Schist
Mica Schist
Medium to coarse-grained metamorphic rock with a foliated texture. Characterized by prominent, parallel-aligned mica flakes (muscovite or biotite) giving a shiny or glittery appearance. Can range in color from silvery-white to dark brown/black depending on the mica type. Hardness varies but generally around 3-4.
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Physical properties
Medium to coarse-grained metamorphic rock with a foliated texture. Characterized by prominent, parallel-aligned mica flakes (muscovite or biotite) giving a shiny or glittery appearance. Can range in color from silvery-white to dark brown/black depending on the mica type. Hardness varies but generally around 3-4.
Formation & geological history
Formed from regional metamorphism of shale, mudstone, or felsic igneous rocks under intermediate grade temperature and pressure conditions.
Uses & applications
Mostly used in construction for decorative stone, paving, and sometimes in landscaping. High-grade schist with garnet can be a source of garnet abrasive.
Geological facts
Schistosity is the distinctive foliation in these rocks, meaning they easily split into thin layers.
Field identification & locations
Identified by its highly reflective surface due to aligned mica minerals. Very common in mountainous regions undergoing mountain building (orogeny).
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