metamorphic
Gneiss
Gneiss
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, banded texture with alternating light and dark layers, dull to vitreous luster, foliated structure.
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Physical properties
Hardness of 6-7 on Mohs scale, banded texture with alternating light and dark layers, dull to vitreous luster, foliated structure.
Formation & geological history
Formed by high-temperature and high-pressure metamorphic processes altering pre-existing igneous or sedimentary rocks deep within the Earth's crust.
Uses & applications
Used primarily as dimension stone in construction, building facades, and road aggregates.
Geological facts
Gneiss contains some of the oldest known rock material on Earth, dating back over 4 billion years.
Field identification & locations
Identified by its distinct compositional banding (gneissic banding) and commonly found in ancient continental shields.
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