metamorphic
Granite Veined Gneiss
Orthogneiss with Granitic Intrusion
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale, grayish-brown color with pinkish felsic banding, dull to vitreous luster, foliated crystal structure.
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Physical properties
Hardness of 6-7 on Mohs scale, grayish-brown color with pinkish felsic banding, dull to vitreous luster, foliated crystal structure.
Formation & geological history
Formed via regional metamorphism of preexisting rocks subjected to intense heat and pressure deep within the Earth's crust, often interbedded with granitic magma injections.
Uses & applications
Used primarily as decorative landscaping stone, crushed aggregate in construction, and occasionally for architectural facing.
Geological facts
The distinct contrasting bands are formed by alternating layers of dark mafic minerals and light felsic minerals under directional stress.
Field identification & locations
Easily identified by its distinct gneissic banding intersected by lighter granitic veins; commonly found in ancient shield areas and mountainous orogenic belts.
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