metamorphic
Gneiss
Metamorphic Gneiss
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, characterized by distinct alternating light and dark mineral banding (foliation), vitreous luster.
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Physical properties
Hardness of 6-7 on Mohs scale, characterized by distinct alternating light and dark mineral banding (foliation), vitreous luster.
Formation & geological history
Formed through high-grade regional metamorphism of pre-existing igneous or sedimentary rocks under extreme heat and pressure deep within the Earth's crust.
Uses & applications
Used primarily as crushed stone for construction, road building, and dimension stone for building facades.
Geological facts
Some gneiss formations contain some of the oldest known rock material on Earth, dating back over 4 billion years.
Field identification & locations
Easily identified by its zebra-like compositional banding and is commonly found in ancient continental shields.
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