metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and typically white, gray, or pinkish in color due to iron oxide impurities.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, conchoidal fracture, and typically white, gray, or pinkish in color due to iron oxide impurities.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, often during mountain-building events over millions of years.
Uses & applications
Used extensively in construction as crushed stone for road bases, railroad ballast, and as a decorative building stone or durable countertop material.
Geological facts
Quartzite is extremely durable and weather-resistant, which is why ridges formed of quartzite often survive as prominent hills or mountain crests.
Field identification & locations
Can be identified by its inability to be scratched by steel and its refusal to fizz with hydrochloric acid; commonly found in mountainous regions worldwide.
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