metamorphic
Schist
Mica Schist
Hardness: 3.5–4 on Mohs scale; Color: Gray, silver, brown, or goldish due to mica; Luster: Sub-metallic to pearly (shimmering); Structure: Foliated with visible mineral grains; Cleavage: Perfect basal cleavage in individual mica flakes.
- Hardness
- 3
- Color
- Gray, silver, brown, or goldish due to mica
- Luster
- Sub-metallic to pearly (shimmering)
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Physical properties
Hardness: 3.5–4 on Mohs scale; Color: Gray, silver, brown, or goldish due to mica; Luster: Sub-metallic to pearly (shimmering); Structure: Foliated with visible mineral grains; Cleavage: Perfect basal cleavage in individual mica flakes.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high grades of temperature and pressure. It is typically associated with mountain-building events (orogenies).
Uses & applications
Used historically as a building stone, for flagstone, and in sculpture. Fine-grained varieties are sometimes used for whetstones. Its shimmering appearance makes it a popular specimen for educational collections.
Geological facts
Schist is characterized by 'schistosity,' which is the alignment of platy minerals like mica that allows the rock to be split into thin flakes or slabs. It represents a higher metamorphic grade than slate or phyllite.
Field identification & locations
Identify in the field by its distinct glittering or sparkly appearance under sunlight. Look for the 'foliation'—thin, wavy layers of minerals that often peel apart easily.
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