metamorphic
Mica Schist
Schist (Crystalline metamorphic rock)
Hardness: 3.5-4 (Mohs); Color: Silver, gray, or bronze with a metallic sheen; Luster: Pearly to sub-metallic; Structure: Foliated (schistosity); Cleavage: Perfect basal on mica grains; SG: 2.7-2.9
- Hardness
- 3
- Color
- Silver, gray, or bronze with a metallic sheen
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4 (Mohs); Color: Silver, gray, or bronze with a metallic sheen; Luster: Pearly to sub-metallic; Structure: Foliated (schistosity); Cleavage: Perfect basal on mica grains; SG: 2.7-2.9
Formation & geological history
Formed by the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature conditions. This process aligns flat mineral grains (micas) into parallel layers.
Uses & applications
Primarily used as a decorative stone in landscape architecture, flagging, wall veneers, and occasionally for roofing or interior floor tiles due to its planar split.
Geological facts
The word schist is derived from the Greek word 'schistos', meaning 'split', referring to the ease with which the rock can be cleaved along the planes of its plate-like minerals.
Field identification & locations
Identified by its distinctive 'schistosity'—a strong foliation—and a glittery appearance caused by large, visible flakes of mica. Commonly found in mountainous regions or eroded continental shields.
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