metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Grey, silver, charcoal; Luster: Pearly to sub-metallic due to mica; Crystal Structure: Medium-grained foliated; Cleavage: Perfect basal cleavage in individual mica flakes.
- Hardness
- 3
- Color
- Grey, silver, charcoal
- Luster
- Pearly to sub-metallic due to mica
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Physical properties
Hardness: 3.5-4; Color: Grey, silver, charcoal; Luster: Pearly to sub-metallic due to mica; Crystal Structure: Medium-grained foliated; Cleavage: Perfect basal cleavage in individual mica flakes.
Formation & geological history
Formed from intermediate-grade regional metamorphism of clay-rich sedimentary rocks like shale. Under high pressure and temperature, minerals align into wavy layers called schistosity.
Uses & applications
Used as decorative stone, flagstone for walkways, and sometimes as a source of industrial minerals like garnet or mica. In some cultures, it is used for building material.
Geological facts
The word 'schist' comes from the Greek word 'schistos', meaning 'split', referring to the ease with which these rocks can be divided into thin plates. It often contains larger gemstones like garnets embedded in the matrix.
Field identification & locations
Identify by its sparkly, 'glittery' appearance when held under the sun and its layered (foliated) texture. Commonly found in mountain ranges and areas with ancient tectonic activity.
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