metamorphic
Schist
Metamorphic Rock (Mica Schist)
Hardness: 3-4 (depending on mineral content), Color: Gray, silver, green, or brown, Luster: Pearly to shiny due to abundant mica, Crystal Structure: Foliated with large, visible mineral grains (schistosity), Cleavage: Well-developed foliation planes, Specific Gravity: 2.7-2.9
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Physical properties
Hardness: 3-4 (depending on mineral content), Color: Gray, silver, green, or brown, Luster: Pearly to shiny due to abundant mica, Crystal Structure: Foliated with large, visible mineral grains (schistosity), Cleavage: Well-developed foliation planes, Specific Gravity: 2.7-2.9
Formation & geological history
Formed by regional metamorphism of mudstones or shales under high temperatures and pressures, typically ranging from Proterozoic to Phanerozoic eons.
Uses & applications
Used in landscaping, decorative stone, road construction, and occasionally in the production of mineral specimens for educational purposes.
Geological facts
Schist is intermediate in metamorphic grade between slate and gneiss. The prominent parallel alignment of platy minerals like mica gives it a characteristic sparkling appearance when light hits the cleavage planes.
Field identification & locations
Easily identified in the field by its distinct foliation and sparkly, scaly appearance due to visible mica flakes. Commonly found in mountainous regions and areas with ancient continental shields.
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