metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white to gray with vitreous luster, granular crystal structure, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white to gray with vitreous luster, granular crystal structure, and conchoidal fracture.
Formation & geological history
Formed from quartz-rich sandstone subjected to high heat and pressure during tectonic metamorphism.
Uses & applications
Used extensively in construction, dimension stone, railroad ballast, and manufacture of silica brick.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering, often forming prominent mountain ridges.
Field identification & locations
Identified by its inability to be scratched by steel and lack of effervescence with acid; found globally in ancient mountain belts.
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