metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically pink to reddish-brown, vitreous to greasy luster, non-foliated massive crystal structure, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically pink to reddish-brown, vitreous to greasy luster, non-foliated massive crystal structure, and conchoidal fracture.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, often during mountain-building events.
Uses & applications
Used in construction, railroad ballast, crushed stone for road surfaces, and as a decorative stone in landscaping.
Geological facts
Quartzite is extremely durable and weather-resistant, which is why ridges formed of quartzite often persist as high mountain crests.
Field identification & locations
Identified by its inability to be scratched by steel and its lack of fizz when tested with acid. Found worldwide in ancient mountain belts.
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