metamorphic
Banded Schist
Mica Schist
Hardness: 3.5-5 (Mohs scale); Color: Silvery-grey with brownish iron oxidization; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Perfect basal cleavage in mica layers; Specific Gravity: 2.7-2.9
- Hardness
- 3
- Color
- Silvery-grey with brownish iron oxidization
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-5 (Mohs scale); Color: Silvery-grey with brownish iron oxidization; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Perfect basal cleavage in mica layers; Specific Gravity: 2.7-2.9
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high temperatures and pressures. Most schistose rocks are Precambrian to Paleozoic in age.
Uses & applications
Used primarily as decorative stone, flagstone for walkways, and sometimes as a minor source of industrial micas or crushed stone in construction.
Geological facts
The word schist is derived from the Greek word 'schistos,' meaning 'split,' referring to the ease with which the rock can be cleaved into thin plates along its foliation planes.
Field identification & locations
Identify by its distinct layered (foliated) appearance and the presence of visible mica flakes that glitter in the light. Often found in mountainous regions near convergent plate boundaries or glacial till.
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