metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white, gray, or pinkish-brown in color, with a vitreous to greasy luster and a non-foliated, granular crystal structure.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or pinkish-brown in color, with a vitreous to greasy luster and a non-foliated, granular crystal structure.
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and tectonic pressure, commonly over hundreds of millions of years.
Uses & applications
Used extensively in construction, railway ballast, dimension stone, and for manufacturing silica refractory bricks.
Geological facts
Quartzite is extremely durable and weather-resistant, which is why ridges made of quartzite often form prominent mountain crests.
Field identification & locations
Identify in the field by its sugary texture, inability to be scratched by a steel knife, and failure to fizz with acid. Found globally in ancient mountain belts.
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