metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Silvery-gray, brownish, or golden-tan; Luster: Pearly to sub-metallic; Crystal Structure: Foliated with visible mica flakes; Cleavage: Perfect basal cleavage in individual mineral grains; Specific Gravity: 2.7-2.8
- Hardness
- 3
- Color
- Silvery-gray, brownish, or golden-tan
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4; Color: Silvery-gray, brownish, or golden-tan; Luster: Pearly to sub-metallic; Crystal Structure: Foliated with visible mica flakes; Cleavage: Perfect basal cleavage in individual mineral grains; Specific Gravity: 2.7-2.8
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature. The original clay minerals recrystallize into large, platy minerals like muscovite and biotite.
Uses & applications
Used primarily as decorative stone, flagstone for landscaping, roofing material, and occasionally as a source of industrial mica or abrasive materials.
Geological facts
The word 'schist' comes from the Greek word 'schizein', meaning 'to split', referring to the stone's tendency to split into thin layers along its foliation planes.
Field identification & locations
Look for a distinct 'glitter' when the rock is turned in the light, created by the alignment of mica plates. It is commonly found in mountain ranges and metamorphic belts globally.
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