metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white or gray, vitreous luster, non-foliated massive crystal structure, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or gray, vitreous luster, non-foliated massive crystal structure, and conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under extreme heat and tectonic pressure, typically over hundreds of millions of years.
Uses & applications
Used widely in construction for dimension stone, roofing tiles, railroad ballast, and manufacturing silica refractory bricks.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming the highest mountain ridges in a given landscape.
Field identification & locations
Identified by its inability to be scratched by a steel knife and lack of fizzing when tested with dilute hydrochloric acid. Found globally in mountain belts.
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