metamorphic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
Hardness: 3-4 (but varies); Color: Silvery-gray, brownish, or golden; Luster: Pearly to metallic (glittery); Structure: Foliated (schistosity) with visible plates; Cleavage: Excellent in one direction (micaceous).
- Hardness
- 3-4 (but varies)
- Color
- Silvery-gray, brownish, or golden
- Luster
- Pearly to metallic (glittery)
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Physical properties
Hardness: 3-4 (but varies); Color: Silvery-gray, brownish, or golden; Luster: Pearly to metallic (glittery); Structure: Foliated (schistosity) with visible plates; Cleavage: Excellent in one direction (micaceous).
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high grade temperatures and pressures. Most prevalent in Precambrian or Paleozoic aged mountain-building belts.
Uses & applications
Used primarily as decorative stone, flagstone for walkways, wall cladding, and occasionally as a source of mica for electrical insulation or glitter materials.
Geological facts
The word 'schist' is derived from the Greek 'schistos', meaning 'split', referring to the way the rock easily divides into thin plates along its mica layers.
Field identification & locations
Identify by the prominent 'glitter' effect and the visible alignment of flat minerals. Common in metamorphic terrains such as the Appalachian or Alpine mountains. Collectors should look for garnets which often grow within schist.
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