metamorphic
Mica Schist
Metamorphic Rock (rich in Muscovite or Biotite mica)
Hardness: 2-3 on Mohs scale (for the mica minerals), Color: Silvery-gray to green or black, Luster: Highly pearly or metallic/shiny due to abundant platy mica flakes, Crystal Structure: Foliated with visible schistosity, Specific Gravity: 2.7-2.9
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Physical properties
Hardness: 2-3 on Mohs scale (for the mica minerals), Color: Silvery-gray to green or black, Luster: Highly pearly or metallic/shiny due to abundant platy mica flakes, Crystal Structure: Foliated with visible schistosity, Specific Gravity: 2.7-2.9
Formation & geological history
Formed through regional metamorphism of argillaceous rocks like shale or mudstone under moderate to high temperatures and pressures.
Uses & applications
Used primarily in landscaping, decorative stone, and historically as an electrical insulator and in filler materials.
Geological facts
Mica schist is well-known for its striking, glittery appearance caused by the parallel alignment of reflective mica flakes. When weathered, schist often breaks down into sparkling soils.
Field identification & locations
Easily identified by its prominent foliation (schistosity) and the distinct sparkle of mica flakes on its cleavage planes. Found worldwide in regions with ancient mountain building events.
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