metamorphic
Gneiss
Gneiss
AI-generated identification · may be incorrectHardness 6-7 on the Mohs scale, characterized by distinct alternating light and dark mineral bands. It features a granular texture and vitreous 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 6-7 on the Mohs scale, characterized by distinct alternating light and dark mineral bands. It features a granular texture and vitreous luster.
Formation & geological history
Formed through high-grade regional metamorphism of preexisting igneous or sedimentary rocks under intense heat and pressure deep within the Earth's crust.
Uses & applications
Commonly used in construction as crushed stone for road bases, building facades, and dimension stone.
Geological facts
Gneiss can originate from either granite or shale precursors, and some of the oldest rocks on Earth are ancient gneisses dated to over 4 billion years old.
Field identification & locations
Easily identified in the field by its pronounced compositional banding, known as gneissic banding. Found globally in ancient continental shields.
More like this
