metamorphic
Gneiss
Gneiss
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, foliated texture with distinct alternating light and dark bands, vitreous to dull luster.
Identified More metamorphic →
Explore Gneiss in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 6-7 on Mohs scale, foliated texture with distinct alternating light and dark bands, vitreous to dull luster.
Formation & geological history
Formed through high-grade regional metamorphism of pre-existing igneous or sedimentary rocks under intense heat and directional pressure.
Uses & applications
Commonly utilized as crushed stone for building construction, landscaping, and exterior facing stone.
Geological facts
Some gneiss formations contain some of the oldest known rock material on Earth, dating back over 4 billion years.
Field identification & locations
Identified in the field by its characteristic zebra-like banding called gneissic banding, found globally in ancient continental shields.
More like this
