metamorphic
Mica Schist
Schist (Muscovite-Quartz Schist)
Hardness: 3.5-5 (variable based on quartz content); Color: Silvery-grey to golden brown; Luster: Pearly to sub-metallic; Structure: Foliated with visible mica flakes (schistosity); Cleavage: Perfect basal cleavage in individual mica crystals.
- Hardness
- 3
- Color
- Silvery-grey to golden brown
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-5 (variable based on quartz content); Color: Silvery-grey to golden brown; Luster: Pearly to sub-metallic; Structure: Foliated with visible mica flakes (schistosity); Cleavage: Perfect basal cleavage in individual mica crystals.
Formation & geological history
Formed through regional metamorphism of shale or mudstone at intermediate temperatures and pressures. Most common in ancient mountain ranges and metamorphic belts from various geological eras.
Uses & applications
Mainly used as decorative stone, flagstone for paving, or crushed for garden landscaping. Historically used for roofing or simple construction.
Geological facts
The word 'schist' is derived from the Greek meaning 'to split,' referring to the ease with which it can be divided into thin sheets. It is the bridge between phyllite and gneiss in the metamorphic grading sequence.
Field identification & locations
Identify by its 'sparkly' or metallic sheen caused by mica crystals and its ability to split into uneven plates. Commonly found in eroded mountain roots or Appalachian-style regions.
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