metamorphic
Gneiss
Gneiss
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, typically exhibits alternating light and dark compositional bands, vitreous to dull luster, and foliated crystalline structure.
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Physical properties
Hardness of 6-7 on Mohs scale, typically exhibits alternating light and dark compositional bands, vitreous to dull luster, and foliated crystalline structure.
Formation & geological history
Formed by high-temperature and high-pressure metamorphic processes acting on pre-existing igneous or sedimentary rocks deep within the Earth's crust.
Uses & applications
Used primarily as crushed stone for road construction, building facades, and dimension stone.
Geological facts
Gneiss contains some of the oldest known rock material on Earth, dating back over 4 billion years in certain formations.
Field identification & locations
Identified easily by its distinctive banded appearance, known as gneissic banding; found globally in continental shields and ancient mountain cores.
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