metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Grey, silver, green, or brown; Luster: Pearly to sub-metallic due to mica; Crystal structure: Foliated with visible mineral grains; Cleavage: Excellent basal cleavage in mica components; Specific gravity: 2.7-2.8
- Hardness
- 3
- Color
- Grey, silver, green, or brown
- Luster
- Pearly to sub-metallic due to mica
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3.5-4; Color: Grey, silver, green, or brown; Luster: Pearly to sub-metallic due to mica; Crystal structure: Foliated with visible mineral grains; Cleavage: Excellent basal cleavage in mica components; Specific gravity: 2.7-2.8
Formation & geological history
Formed from the metamorphism of shale or mudstone under intermediate to high temperatures and pressures. This creates large mineral grains like mica, giving it a characteristic sheen.
Uses & applications
Used primarily in construction for decorative stones, flagstones, and garden paths. Some varieties are used as building veneers or as abrasive materials.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the ease with which the rock can be split into flakes or layers. It often contains garnets.
Field identification & locations
Identify by its shiny, flaky appearance and 'schistosity' (distinct layering). Commonly found in mountain ranges or areas with a history of plate tectonic collision.
More like this
