metamorphic
Gneiss
Gneiss
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, foliated texture with alternating light and dark bands, vitreous luster, granular crystal structure.
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Physical properties
Hardness of 6-7 on Mohs scale, foliated texture with alternating light and dark bands, vitreous luster, granular crystal structure.
Formation & geological history
Formed through high-grade regional metamorphism of igneous or sedimentary rocks deep within the Earth's crust.
Uses & applications
Used primarily in construction, as crushed stone for road bases, and occasionally as dimension stone for building facades.
Geological facts
Some gneiss formations contain Earth's oldest known rock materials, dating back over 4 billion years.
Field identification & locations
Identified easily by its distinct compositional banding (gneissic banding) separating light quartz and feldspar from dark biotite and amphibole.
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