metamorphic
Mica Schist
Schist (muscovite/biotite rich)
Hardness: 3.5-4; Color: Silver, gray, or greenish with a sparkling surface; Luster: Pearly to submetallic; Crystal Structure: Foliated with visible mica flakes; Cleavage: Perfect basal cleavage on individual mica crystals; Specific Gravity: 2.7-3.0
- Hardness
- 3
- Color
- Silver, gray, or greenish with a sparkling surface
- Luster
- Pearly to submetallic
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Physical properties
Hardness: 3.5-4; Color: Silver, gray, or greenish with a sparkling surface; Luster: Pearly to submetallic; Crystal Structure: Foliated with visible mica flakes; Cleavage: Perfect basal cleavage on individual mica crystals; Specific Gravity: 2.7-3.0
Formation & geological history
Formed through the regional metamorphism of shale or mudstone at intermediate temperatures and pressures; typically associated with mountain-building events.
Uses & applications
Primarily used as decorative stone, in garden landscaping, and historically for hearths due to its heat resistance. Finely ground mica is used in cosmetics and paints for its shimmer.
Geological facts
The term 'Schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the rock's ease of splitting along its foliated planes.
Field identification & locations
Identify in the field by its distinct 'schistosity' (wavy layering) and strong sparkle under sunlight. Common in metamorphic belts like the Appalachians or the Alps.
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