metamorphic
Gneiss
Gneiss
AI-generated identification · may be incorrectHardness 6-7 on the Mohs scale, characterized by distinct alternating light and dark compositional bands (gneissic banding) with a granular and foliated texture.
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Physical properties
Hardness 6-7 on the Mohs scale, characterized by distinct alternating light and dark compositional bands (gneissic banding) with a granular and foliated texture.
Formation & geological history
Formed through high-temperature and high-pressure regional metamorphism of pre-existing igneous or sedimentary rocks deep within the Earth's crust.
Uses & applications
Utilized primarily as dimension stone in construction, building facades, paving, and decorative landscaping.
Geological facts
Gneiss contains some of the oldest known rock material on Earth, with certain zircons found within it dating back over 4 billion years.
Field identification & locations
Easily identified in the field by its striking zebra-like alternating light quartz/feldspar and dark biotite/amphibole bands, and commonly found in ancient continental shields.
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