metamorphic
Quartzite
Metamorphic Quartz Arenite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or reddish-brown with a vitreous to greasy luster, massive crystal structure, and lacks visible cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or reddish-brown with a vitreous to greasy luster, massive crystal structure, and lacks visible cleavage.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, commonly over hundreds of millions of years.
Uses & applications
Used extensively in construction as crushed stone for road bases, railroad ballast, and dimension stone for building facades and countertops.
Geological facts
Quartzite is exceptionally weather-resistant, which is why ridges formed of quartzite often persist as high mountain crests and prominent hills.
Field identification & locations
Identified by its inability to be scratched by a knife and its characteristic sugary texture on broken surfaces; found worldwide in ancient mountain belts.
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