metamorphic
Mica Schist
Mica Schist
Hardness: 3.5-5 (Mohs scale); Color: silvery-grey to greyish-green; Luster: Pearly to sub-metallic due to mica; Crystal Structure: Foliated with visible flaky minerals; Cleavage: Basal cleavage in mica flakes; Specific Gravity: 2.7-3.0.
- Hardness
- 3
- Color
- silvery-grey to greyish-green
- Luster
- Pearly to sub-metallic due to mica
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Physical properties
Hardness: 3.5-5 (Mohs scale); Color: silvery-grey to greyish-green; Luster: Pearly to sub-metallic due to mica; Crystal Structure: Foliated with visible flaky minerals; Cleavage: Basal cleavage in mica flakes; Specific Gravity: 2.7-3.0.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone at medium grades (temperatures and pressures). It typically originates in mountain-building (orogenic) environments.
Uses & applications
Primarily used as decorative stone in landscaping, flagstone for walkways, and occasionally as a source of mica for lubricants or electrical insulation.
Geological facts
The word 'schist' comes from the Greek word 'schistos,' meaning 'easy to split,' which refers to the rock's characteristic foliation that allows it to break into thin plates.
Field identification & locations
Identify in the field by its distinct 'glittery' appearance and foliated texture where individual mica flakes are large enough to be seen with the naked eye. Commonly found in metamorphic terrains like the Appalachian or Himalayan mountains.
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