metamorphic
Gneiss with Quartz Vein
Foliated Metamorphic Rock
AI-generated identification · may be incorrectHardness 6-7, alternating light and dark compositional bands with a prominent white quartz vein, vitreous luster.
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Physical properties
Hardness 6-7, alternating light and dark compositional bands with a prominent white quartz vein, vitreous luster.
Formation & geological history
Formed under extreme heat and pressure deep within the Earth's crust, recrystallizing from igneous or sedimentary protoliths.
Uses & applications
Used primarily in the construction industry as crushed stone for road bases, building facades, and dimension stone.
Geological facts
Gneiss contains some of the oldest known rock material on Earth, dating back over 4 billion years in certain formations.
Field identification & locations
Easily identified by its distinct alternating dark and light mineral bands, commonly found in continental shield regions.
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