metamorphic
Schist
Mica Schist
Hardness: 3.5–4.0; Color: Silvery-gray, gold-tinted, or bronze due to micas; Luster: Pearly to metallic (shimmering); Crystal Structure: Foliated with visible flakes; Cleavage: Excellent basal cleavage in mineral grains.
- Hardness
- 3
- Color
- Silvery-gray, gold-tinted, or bronze due to micas
- Luster
- Pearly to metallic (shimmering)
Identified More metamorphic →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3.5–4.0; Color: Silvery-gray, gold-tinted, or bronze due to micas; Luster: Pearly to metallic (shimmering); Crystal Structure: Foliated with visible flakes; Cleavage: Excellent basal cleavage in mineral grains.
Formation & geological history
Formed through medium-grade regional metamorphism of shale or mudstone. Subjected to higher temperatures and pressures than slate/phyllite, typically during mountain-building events.
Uses & applications
Historically used for flagstone, roofing, and wall construction. Modern use is primarily decorative in landscaping or as a source of industrial mica.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the ease with which it can be split along the plane of its platy minerals.
Field identification & locations
Identify by its 'schistosity' (distinct layering) and the way it pinholes or sparkles in sunlight. Found in metamorphic belts like the Appalachians, Alps, or Himalayas.
More like this
