metamorphic
Mica Schist
Mica Schist (Muscovite subclass)
Hardness: 2-2.5 on Mohs scale; Color: Silvery-gray to white with a pearly sheen; Luster: Vitreous to silky; Structure: Foliated with prominent mica flakes; Cleavage: Perfect basal cleavage in individual flakes.
- Hardness
- 2-2
- Color
- Silvery-gray to white with a pearly sheen
- Luster
- Vitreous to silky
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Physical properties
Hardness: 2-2.5 on Mohs scale; Color: Silvery-gray to white with a pearly sheen; Luster: Vitreous to silky; Structure: Foliated with prominent mica flakes; Cleavage: Perfect basal cleavage in individual flakes.
Formation & geological history
Formed through the regional metamorphism of shale or clay-rich sedimentary rocks under medium-grade pressure and temperature conditions. Typically associated with mountain-building events.
Uses & applications
Used historically as a building stone, in the production of filler materials, for electrical insulation (due to mica content), and occasionally in decorative landscaping.
Geological facts
The word 'schist' is derived from the Greek 'schizein', meaning 'to split', referring to the rock's ease of splitting along the planes of its mica minerals.
Field identification & locations
Identify by its sparkly, silvery appearance and distinct layering (foliation). It often feels slightly greasy or flaky to the touch and easily sheds small glittery scales.
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