metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and typically white to gray with dark mineral banding.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and typically white to gray with dark mineral banding.
Formation & geological history
Formed when quartz-rich sandstone or chert is subjected to high heat and pressure, typically during tectonic mountain-building events.
Uses & applications
Used widely in construction as crushed stone for road bases, dimension stone, and in the manufacturing of refractory bricks.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, which is why mountain ridges made of it often form high crests.
Field identification & locations
Identified by its inability to be scratched by a knife and lack of fizz with hydrochloric acid; found worldwide in ancient mountain belts.
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