metamorphic
Mica Schist
Metamorphic Rock (Schistose)
Hardness: 3-4 (due to abundant mica), Color: Silver-grey to brownish, Luster: Pearly to metallic on cleavage planes, Crystal Structure: Foliated with visible platy mineral grains, Specific Gravity: 2.5-2.9
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Physical properties
Hardness: 3-4 (due to abundant mica), Color: Silver-grey to brownish, Luster: Pearly to metallic on cleavage planes, Crystal Structure: Foliated with visible platy mineral grains, Specific Gravity: 2.5-2.9
Formation & geological history
Formed through regional metamorphism of argillaceous sedimentary rocks like shale or mudstone, subjected to elevated temperatures and pressures over millions of years (commonly Precambrian to Paleozoic eras).
Uses & applications
Used locally as decorative stone, facing stone in landscaping, and historically for whetstones. Not typically used in heavy structural construction due to its foliated weakness.
Geological facts
Schist is characterized by foliation so well developed that the rock can be readily split into thin flakes or slabs. The sparkling appearance comes from countless microscopic to medium-sized flakes of mica, such as muscovite or biotite.
Field identification & locations
Easily identified in the field by its pronounced foliation (schistosity) and abundant sparkling mica flakes reflecting light. Common in mountainous regions and areas with deeply eroded ancient mountain belts.
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