metamorphic
Schist
Mica Schist (Composition typically involves Muscovite, Biotite, Quartz, and Feldspar)
Hardness: 3.5–4 on Mohs scale; Color: Silvery-gray, brownish-yellow, or green; Luster: Pearly to sub-metallic; Structure: Foliated (schistosity); Specific gravity: 2.5–2.9.
- Hardness
- 3
- Color
- Silvery-gray, brownish-yellow, or green
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5–4 on Mohs scale; Color: Silvery-gray, brownish-yellow, or green; Luster: Pearly to sub-metallic; Structure: Foliated (schistosity); Specific gravity: 2.5–2.9.
Formation & geological history
Formed from the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature. It is characterized by the alignment of platy minerals such as micas.
Uses & applications
Primary uses include architectural stone, decorative garden stones, and as a component in construction aggregate and paving stones.
Geological facts
Schist is intermediate in metamorphic grade between phyllite and gneiss. The name comes from the Greek word 'schistos,' meaning 'easy to split,' referring to its prominent foliation.
Field identification & locations
Identify in the field by its distinct layering (foliation) and shiny, reflective surface caused by mica flakes. Common in mountainous regions with a history of tectonic activity. Look for a 'scaly' appearance.
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