metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, colors range from white to pink and brown, vitreous luster, non-foliated massive crystal structure, no distinct cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, colors range from white to pink and brown, vitreous luster, non-foliated massive crystal structure, no distinct cleavage, specific gravity around 2.65.
Formation & geological history
Formed from quartz-rich sandstone subjected to intense heat and pressure during tectonic metamorphism, often over hundreds of millions of years.
Uses & applications
Used extensively in construction, railway ballast, decorative aggregate, and manufacture of silica brick and glass.
Geological facts
Quartzite is extremely durable and weather-resistant, which is why ridges formed by quartzite often remain as prominent hills.
Field identification & locations
Identified by its sugary texture on fractured surfaces and failure to scratch with a steel knife; common worldwide in mountainous metamorphic belts.
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