metamorphic
Banded Gneiss
Gneiss
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale; displays distinct alternating light and dark compositional banding (gneissic banding); vitreous to dull luster; granular texture.
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Physical properties
Hardness 6-7 on Mohs scale; displays distinct alternating light and dark compositional banding (gneissic banding); vitreous to dull luster; granular texture.
Formation & geological history
Formed through high-grade regional metamorphism of preexisting igneous or sedimentary rocks under extreme heat and pressure, typically during continental collisions.
Uses & applications
Used as crushed stone for road construction, building facades, and decorative landscaping blocks.
Geological facts
Gneiss contains some of the oldest known mineral fragments on Earth, dating back over 4 billion years.
Field identification & locations
Identified by its zebra-like light and dark mineral bands, commonly found in ancient shield areas of continental crust.
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