metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray or pinkish-brown, vitreous luster, and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray or pinkish-brown, vitreous luster, and non-foliated massive crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure deep within the Earth's crust.
Uses & applications
Used widely in construction, railroad ballast, decorative aggregate, and manufacturing of silica bricks and glass.
Geological facts
Quartzite is extremely durable and weather-resistant, often forming prominent mountain ridges because it erodes much slower than surrounding rocks.
Field identification & locations
Identify by its ability to scratch glass and lack of effervescence with hydrochloric acid; commonly found worldwide in ancient mountain belts.
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