metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown, gray, or white with a vitreous to greasy luster. Massive to granular crystal structure with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown, gray, or white with a vitreous to greasy luster. Massive to granular crystal structure with conchoidal fracture.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and tectonic pressure during regional metamorphism, often over hundreds of millions of years.
Uses & applications
Used extensively in construction, road aggregate, railroad ballast, and decorative building stone due to extreme durability.
Geological facts
Quartzite is extremely resistant to chemical weathering and erosion, often forming prominent mountain ridges. It is harder than standard steel and will scratch glass easily.
Field identification & locations
Identified in the field by its inability to be scratched by a knife and lack of acid reaction. Found globally in ancient mountain belts and tectonic suture zones.
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