metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, colors ranging from white to gray and yellowish-brown, vitreous luster, and a non-foliated massive crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from white to gray and yellowish-brown, vitreous luster, and a non-foliated massive crystal structure.
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone subjected to intense heat and pressure deep within the Earth's crust.
Uses & applications
Used widely in construction for road aggregate, railroad ballast, and as dimension stone, as well as in manufacturing refractories.
Geological facts
Quartzite is exceptionally durable and weather-resistant, often forming prominent mountain ridges and erosion-resistant landforms.
Field identification & locations
Identified by its inability to be scratched by glass and its sugary texture on broken surfaces; commonly found globally in ancient mountain belts.
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