metamorphic
Mica Schist
Schist (primarily muscovite and quartz)
Hardness: 2-3 (mica) to 7 (quartz); Color: Silver, gray, or white with a pearly to metallic luster; Texture: Foliated with prominent schistosity; Cleavage: Perfect basal cleavage in mica flakes; Crystal structure: Monoclinic (muscovite).
- Hardness
- 2-3 (mica) to 7 (quartz)
- Color
- Silver, gray, or white with a pearly to metallic luster
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Physical properties
Hardness: 2-3 (mica) to 7 (quartz); Color: Silver, gray, or white with a pearly to metallic luster; Texture: Foliated with prominent schistosity; Cleavage: Perfect basal cleavage in mica flakes; Crystal structure: Monoclinic (muscovite).
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high temperatures and pressures. Over time, the clay minerals transform into large, visible flakes of mica. The regional location near the Pamir Mountains (Tajikistan/China border) is a significant zone of metamorphic activity due to the collision of the Indian and Eurasian plates.
Uses & applications
Used historically as a building stone or for flagstones. Mica specifically is used in electronics for insulation, in cosmetics for shimmer, and as a temperature-resistant window in furnaces.
Geological facts
The word 'schist' is derived from the Greek word 'schistos,' meaning 'to split,' referring to the ease with which the rock can be layered or split. The shimmering effect is due to the parallel alignment of mica flakes reflecting light.
Field identification & locations
Identify by its distinct 'sparkle' and flaky, layered appearance. It can often be scratched with a copper penny or even a fingernail if pulling at the individual mica sheets. Common in orogenic (mountain-building) belts like the Pamirs.
