metamorphic
Banded Gneiss
Gneiss
AI-generated identification · may be incorrectHardness: 6-7, Color: alternating light (feldspar/quartz) and dark (mafic minerals) bands, Luster: dull to vitreous, Cleavage: poor
- Luster
- dull to vitreous, Cleavage: poor
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Physical properties
Hardness: 6-7, Color: alternating light (feldspar/quartz) and dark (mafic minerals) bands, Luster: dull to vitreous, Cleavage: poor
Formation & geological history
Formed from regional metamorphism of igneous or sedimentary rocks under high temperature and pressure.
Uses & applications
Used as building material, landscaping stone, and occasionally polished for ornamental use.
Geological facts
Gneiss is one of the most common rocks in the Earth's lower crust.
Field identification & locations
Identified by its distinct banding (gneissic banding). Commonly found in areas of ancient continental crust.
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