metamorphic
Quartzite
Metamorphic Quartz Sandstone (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, grayish-blue color, vitreous to greasy luster, and a dense, interlocking crystalline structure with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, grayish-blue color, vitreous to greasy luster, and a dense, interlocking crystalline structure with conchoidal fracture.
Formation & geological history
Formed when quartz-rich sandstone is subjected to high heat and pressure, typically during tectonic mountain-building events over millions of years.
Uses & applications
Used widely in construction for road aggregate, railroad ballast, and dimension stone, as well as in manufacturing refractories and tiles.
Geological facts
Quartzite is extremely resistant to chemical weathering and erosion, which explains why ancient mountain ranges often weather down to ridges of pure quartzite.
Field identification & locations
Identify by testing its hardness against glass and observing its ability to scratch steel; found globally in mountainous regions and ancient cratons.
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