metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Grey, green, silver, or brown; Luster: Silky to metallic due to mica content; Structure: Foliated with visible mineral grains; Cleavage: Perfect in one direction (micaceous)
- Hardness
- 3
- Color
- Grey, green, silver, or brown
- Luster
- Silky to metallic due to mica content
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Physical properties
Hardness: 3.5-4; Color: Grey, green, silver, or brown; Luster: Silky to metallic due to mica content; Structure: Foliated with visible mineral grains; Cleavage: Perfect in one direction (micaceous)
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high temperatures and pressures, typically during mountain-building events.
Uses & applications
Used primarily as decorative stone, flagstone for walkways, and sometimes as a source of industrial minerals like garnet or graphite found within the rock.
Geological facts
Schist is characterized by 'schistosity,' a texture where mineral grains are large enough to be seen with the naked eye and are arranged in thin, wavy layers.
Field identification & locations
Identify in the field by its distinct flaky, layered appearance and its ability to sparkle or glitter when held in the light. Commonly found in metamorphic terrains like the Appalachian or Alpine mountains.
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