metamorphic
Gneiss
Metamorphic silicate rock
AI-generated identification · may be incorrectMohs hardness 6-7, typically banded appearance with alternating light and dark mineral layers, vitreous to dull luster, granular crystal structure.
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Physical properties
Mohs hardness 6-7, typically banded appearance with alternating light and dark mineral layers, vitreous to dull luster, granular crystal structure.
Formation & geological history
Formed through high-grade regional metamorphism of pre-existing igneous or sedimentary rocks under extreme heat and pressure.
Uses & applications
Used primarily as dimension stone in construction, building facades, flooring, and landscaping.
Geological facts
Gneiss contains some of the oldest known rock material on Earth, dating back over 4 billion years in certain regions.
Field identification & locations
Identify by its distinct compositional banding (gneissic banding). Found worldwide in ancient continental shields.
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