metamorphic
Green Mica Schist
Mica Schist (Fuchsite or Chlorite variety)
Hardness: 2-3 (Mohs scale), Color: Silvery-green to dull grey-green, Luster: Pearly to sub-metallic, Crystal Structure: Monoclinic (platy/foliated), Cleavage: Perfect basal cleavage
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Physical properties
Hardness: 2-3 (Mohs scale), Color: Silvery-green to dull grey-green, Luster: Pearly to sub-metallic, Crystal Structure: Monoclinic (platy/foliated), Cleavage: Perfect basal cleavage
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks (shale) or specific igneous rocks under medium-grade temperature and pressure conditions.
Uses & applications
Used primarily as decorative stone, in landscaping, or occasionally as a source for certain minerals if high concentrations are present.
Geological facts
The 'sparkle' in schist comes from the alignment of mica flakes. If the green color is particularly vibrant, it may contain Fuchsite, which is a chromium-rich variety of Muscovite.
Field identification & locations
Look for a distinct 'schistose' texture where the rock easily splits into thin plates or flakes. It often feels slightly greasy or soapy if chlorite is present.
