metamorphic
Gneiss
Gneiss
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, characterized by distinct alternating light and dark compositional banding (gneissic banding) with granular texture.
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Physical properties
Hardness of 6-7 on Mohs scale, characterized by distinct alternating light and dark compositional banding (gneissic banding) with granular texture.
Formation & geological history
Formed by 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 in construction, dimension stone for buildings, and decorative landscaping or paving materials.
Geological facts
Gneiss can contain some of the oldest minerals found on Earth, dating back over 4 billion years.
Field identification & locations
Identify in the field by its characteristic zebra-like alternating light and dark mineral bands. Found worldwide in ancient shield areas and core mountain ranges.
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