metamorphic
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite sheet silicates)
Hardness: 2-3 (mica) and 7 (quartz); Color: Silver, grey, or black with sparkling luster; Crystal structure: Monoclinic; Cleavage: Perfect basal cleavage in micas; Specific gravity: 2.7-3.0
- Hardness
- 2-3 (mica) and 7 (quartz)
- Color
- Silver, grey, or black with sparkling luster
Identified More metamorphic →
Explore Mica Schist with Quartz in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 2-3 (mica) and 7 (quartz); Color: Silver, grey, or black with sparkling luster; Crystal structure: Monoclinic; Cleavage: Perfect basal cleavage in micas; Specific gravity: 2.7-3.0
Formation & geological history
Formed under medium-grade regional metamorphism of shale or mudstone. Subjected to higher temperatures and pressures than phyllite, leading to the growth of large, visible plate-like crystals. Found in mountain belts and Precambrian shields.
Uses & applications
Used as decorative stone in gardens, construction filler, and occasionally for its mica content in electronics or as a ground lubricant. Collectors value it for its sparkling appearance.
Geological facts
The term 'schist' is derived from the Greek word 'schistos', meaning 'split', referring to its ease of splitting along the plane of the micas. It is the characteristic rock of many of the world's major mountain ranges.
Field identification & locations
Identify in the field by its distinct foliation and 'sparkle' when held in sunlight. Frequently found in regions of former tectonic plate collisions. Collectors should look for garnets often embedded within these layers.
More like this
