metamorphic
Quartzite
Metamorphic Quartz
AI-generated identification · may be incorrectHardness 7 on Mohs scale, typically white, gray, or reddish due to iron oxides. It has a vitreous to greasy luster and non-foliated massive crystal structure.
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Physical properties
Hardness 7 on Mohs scale, typically white, gray, or reddish due to iron oxides. It has a vitreous to greasy luster and non-foliated massive crystal structure.
Formation & geological history
Formed when quartz-rich sandstone or chert is subjected to high heat and pressure, typically during tectonic compression events over millions of years.
Uses & applications
Used extensively in construction for road aggregate, railroad ballast, and decorative facing stone, as well as in manufacturing refractory bricks.
Geological facts
Quartzite is extremely resistant to weathering and erosion, which is why quartz-rich ridges often form prominent mountain summits.
Field identification & locations
Can be identified by its inability to be scratched by steel and the fact that it fractures across quartz grains rather than around them. Found globally in ancient mountain belts.
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