metamorphic
Mica Schist
Schist (muscovite-quartz dominant)
Hardness: 3.5-4 (varies with quartz content), Color: silvery-gray with tan weathering, Luster: pearly to sub-metallic due to mica flakes, Texture: foliated with visible layering (schistosity)
- Hardness
- 3
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Physical properties
Hardness: 3.5-4 (varies with quartz content), Color: silvery-gray with tan weathering, Luster: pearly to sub-metallic due to mica flakes, Texture: foliated with visible layering (schistosity)
Formation & geological history
Formed from the regional metamorphism of shale or mudstone under medium-grade heat and pressure, often during mountain-building events (orogeny)
Uses & applications
Historically used for walling and flagstones; sometimes used in landscaping or as a source of industrial mica for insulation and cosmetics
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the rock's tendency to split into thin plates. It represents a higher grade of metamorphism than phyllite but lower than gneiss.
Field identification & locations
Look for a distinct 'glitter' or 'sparkle' when rotating the rock in the sun. It will feel somewhat grainy but shows clear parallel alignment of mineral grains. Extremely common in the Cycladic islands of Greece where this photo appears to be taken.
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