metamorphic
Quartzite
Metamorphic Quartz Arenite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous luster, white to grey or reddish color due to iron oxide, and non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous luster, white to grey or reddish color due to iron oxide, and non-foliated massive crystal structure.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone under intense heat and pressure, typically during tectonic mountain-building events over millions of years.
Uses & applications
Used widely in construction for road aggregate, railroad ballast, dimension stone, and in manufacturing refractory bricks and ferrosilicon.
Geological facts
Quartzite is extremely resistant to weathering and erosion, which is why ridges formed of quartzite often stand high above surrounding topography.
Field identification & locations
Identified by its inability to be scratched by steel and its refusal to fizz with hydrochloric acid; common globally in ancient mountain belts.
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