metamorphic
Banded Gneiss
Gneiss
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, distinct alternating light and dark mineral bands (foliation), vitreous luster, and granular crystal structure.
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Physical properties
Hardness 6-7 on Mohs scale, distinct alternating light and dark mineral bands (foliation), vitreous luster, and granular crystal structure.
Formation & geological history
Formed through high-grade regional metamorphism of pre-existing igneous or sedimentary rocks under extreme heat and pressure, typically during Precambrian times.
Uses & applications
Used primarily as crushed stone for road construction, building foundations, and decorative dimension stone.
Geological facts
Gneiss is one of the most common and oldest rocks on Earth, with some specimens dating back over 4 billion years.
Field identification & locations
Easily identified in the field by its striking zebra-like light and dark banding; commonly found in ancient continental shields.
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