metamorphic
Schist
Crystalline Metamorphic Rock (Schistose)
Hardness: 3.5-5 (Mohs); Color: Grey, green, or silvery; Luster: Pearly to sub-metallic due to mica flakes; Structure: Foliated with visible mineral grains; Cleavage: Splits into thin flakes or slabs (schistosity).
- Hardness
- 3
- Color
- Grey, green, or silvery
- Luster
- Pearly to sub-metallic due to mica flakes
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Physical properties
Hardness: 3.5-5 (Mohs); Color: Grey, green, or silvery; Luster: Pearly to sub-metallic due to mica flakes; Structure: Foliated with visible mineral grains; Cleavage: Splits into thin flakes or slabs (schistosity).
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under high pressure and temperature. This specimen's rounded shape indicates it was later eroded and smoothed by river or glacial action.
Uses & applications
Used as decorative stone in landscaping, flagstones for walkways, and sometimes as a minor source of mica or industrial garnet.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the way the rock easily divides along its foliated planes.
Field identification & locations
Identify in the field by looking for a 'shiny' or 'glittery' appearance on the surface caused by mica minerals, and a layered, platy texture. Often found in mountainous regions or riverbeds downstream from metamorphic belts.
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