metamorphic
Gneiss
Metamorphic Gneiss
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, characterized by distinct alternating light and dark mineral bands with a foliated structure and vitreous luster.
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Physical properties
Hardness of 6-7 on Mohs scale, characterized by distinct alternating light and dark mineral bands with a foliated structure and vitreous luster.
Formation & geological history
Formed through high-grade regional metamorphism of pre-existing igneous or sedimentary rocks under extreme temperature and pressure.
Uses & applications
Used primarily as dimension stone, crushed stone for construction, and architectural facing.
Geological facts
Some gneiss formations contain some of the oldest rocks on Earth, dating back over 4 billion years.
Field identification & locations
Easily identified in the field by its characteristic zebra-like banding, known as gneissic banding. Commonly found in ancient shield areas.
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