metamorphic
Mica Schist with Vein
Mica Schist
Hardness 3.5-5, metallic to pearly luster, sparkles brightly due to aligned mica flakes (biotite/muscovite) with a dark quartz or amphibole vein running through it. Foliated texture with distinct schistosity.
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Physical properties
Hardness 3.5-5, metallic to pearly luster, sparkles brightly due to aligned mica flakes (biotite/muscovite) with a dark quartz or amphibole vein running through it. Foliated texture with distinct schistosity.
Formation & geological history
Formed under regional metamorphism of shale or mudstone at medium-grade temperatures and pressures. Commonly associated with mountain-building events (orogenies).
Uses & applications
Used occasionally as decorative dimension stone, flagstone, and in landscape design. Primarily collected as a geological specimen.
Geological facts
The high reflectivity is caused by parallel alignment of flat mica crystals, which reflect light like tiny mirrors. Schist is a metamorphic rock higher in grade than slate and phyllite, but lower than gneiss.
Field identification & locations
Identified in the field by its distinct glittering, flaky appearance and foliated layers. Highly abundant in metamorphic terrains worldwide, especially along ancient or active mountain ranges.
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