Schist
Schist is a metamorphic rock with a foliated texture, meaning it splits into thin layers. It forms from shale or mudstone under pressure and heat. Schist often contains visible mica flakes that give it a shiny appearance, making it easily recognizable.
Physical Properties of Schist
| Texture | Foliated |
| Colors | Gray, green, brown, black (often shiny) |
| Magnetism | Non-magnetic |
| Grain Size | Medium to coarse-grained |
| Hardness | 3 – 4 |
| Density | 2.5 – 2.9 g/cm³ |
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Chemical Properties of Schist
Main Elements:
Si, Al, K, Mg, Fe, O
Chemical Composition:
Variable, typically contains mica, quartz, and feldspar
Health Risk of Schist
Schist dust can cause respiratory irritation. Generally safe to handle, but wear masks when cutting.
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Market Price:
Polished: $0.20 – $2 per piece
Raw/Tumbled: $1 – $5 per piece
Characteristics of Schist
Density:
2.5 – 2.9 g/cm³
Compressive Strength:
Variable
Melting Point:
Variable
Formation:
Forms when shale or mudstone is subjected to heat and pressure, causing the minerals to recrystallize and align into layers.
Composition:
Composed mainly of mica, quartz, and feldspar. The mica gives schist its characteristic shiny, layered appearance.
Types:
- Mica Schist
- Garnet Schist
- Chlorite Schist
- Talc Schist
Etymology:
Derived from the Greek word "schistos" meaning "split" or "divided", referring to its tendency to split into layers.
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Cultural Significance of Schist
Uses:
- Decorative stone
- Roofing material
- Garden landscaping
- Building stone
Distribution:
Found in Scotland, Norway, United States (New England), Brazil, and other regions with metamorphic rocks
Historical Use:
Used in construction and as roofing material. The famous Scottish Highlands are largely made of schist.
Symbolism:
Represents transformation, layers of experience, and adaptability
Frequently Asked Questions
What is schist used for?
Schist is used in decorative stone, roofing material, garden landscaping, and as a building stone.
Why does schist have a shiny appearance?
Schist contains mica minerals that reflect light, giving it a characteristic shiny or sparkly appearance.
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