metamorphic
Banded Gneiss
Gneiss
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, distinct alternating light and dark compositional bands, vitreous to dull luster, foliated crystal structure.
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Physical properties
Hardness 6-7 on Mohs scale, distinct alternating light and dark compositional bands, vitreous to dull luster, foliated crystal structure.
Formation & geological history
Formed through high-grade regional metamorphism of pre-existing igneous or sedimentary rocks under extreme heat and pressure, often over a billion years old.
Uses & applications
Used primarily as dimension stone in construction, building facades, and decorative landscaping.
Geological facts
Gneiss contains some of Earth's oldest known mineral grains, offering crucial insights into early continental formation.
Field identification & locations
Easily identified by its characteristic zebra-like striping (gneissic banding); commonly found in ancient shield areas and cratons worldwide.
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