metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Dark grey to charcoal with silvery sheen; Luster: Pearly to sub-metallic; Structure: Foliated with visible mineral alignment; Common Minerals: Muscovite, biotite, quartz.
- Hardness
- 3
- Color
- Dark grey to charcoal with silvery sheen
- Luster
- Pearly to sub-metallic
Identified More metamorphic →
Explore Schist in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3.5-4; Color: Dark grey to charcoal with silvery sheen; Luster: Pearly to sub-metallic; Structure: Foliated with visible mineral alignment; Common Minerals: Muscovite, biotite, quartz.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature conditions. It typically dates from various periods depending on regional tectonic history.
Uses & applications
Primarily used as decorative stone, flagstone for walkways, garden walls, and occasionally as a source of industrial minerals contained within.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the stone's tendency to split easily along mineral planes.
Field identification & locations
Identify by its 'schistosity' or platy appearance where minerals like mica reflect light. Commonly found in mountain ranges and metamorphic belts. Use a hand lens to see the alignment of mica flakes.
