metamorphic
Schist
Mica Schist (Medium-grade metamorphic rock)
Hardness: 3.5-4 Mohs; Color: Grey, green, or silvery; Luster: Pearly to sub-metallic due to mica; Crystal Structure: Foliated (schistosity); Cleavage: Perfect mica basal cleavage on microscopic levels; Specific Gravity: 2.7-2.8
- Hardness
- 3
- Color
- Grey, green, or silvery
- Luster
- Pearly to sub-metallic due to mica
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Physical properties
Hardness: 3.5-4 Mohs; Color: Grey, green, or silvery; Luster: Pearly to sub-metallic due to mica; Crystal Structure: Foliated (schistosity); Cleavage: Perfect mica basal cleavage on microscopic levels; Specific Gravity: 2.7-2.8
Formation & geological history
Formed from regional metamorphism of shale or mudstone under intermediate pressure and temperature conditions. It typically dates to mountain-building (orogenic) events across various geological eras.
Uses & applications
Used primarily as decorative stone, construction aggregate, and occasionally in landscaping surfaces like flagstone.
Geological facts
The word 'schist' is derived from the Greek 'schizein', meaning 'to split', referring to the rock's ease of splitting along its foliated planes of mica minerals.
Field identification & locations
Identify in the field by looking for a characteristic 'glittery' sheen and thin, wavy layers (foliation). It is commonly found in metamorphic terranes like the Appalachian or Himalayan mountain ranges.
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