metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Dark grey to greenish-black with earthy brown tones; Luster: Sub-metallic to vitreous (due to mica); Structure: Foliated with distinct layering; Cleavage: Good in one direction (slaty/schistose); Specific Gravity: 2.5-2.9
- Hardness
- 3
- Color
- Dark grey to greenish-black with earthy brown tones
- Luster
- Sub-metallic to vitreous (due to mica)
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Physical properties
Hardness: 3.5-4; Color: Dark grey to greenish-black with earthy brown tones; Luster: Sub-metallic to vitreous (due to mica); Structure: Foliated with distinct layering; Cleavage: Good in one direction (slaty/schistose); Specific Gravity: 2.5-2.9
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature. Most specimens date back to the Proterozoic or Paleozoic eras.
Uses & applications
Used primarily as decorative stone, flagstone for walkways, and sometimes as an abrasive or in construction filling.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', which means 'to split,' referring to how easily the rock can be divided into thin plates along its foliation.
Field identification & locations
Identify by looking for 'schistosity,' the parallel alignment of platy minerals like mica that gives the rock a sparkling or flaky appearance. Commonly found in mountainous regions or exposed glacial till.
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