metamorphic
Quartzite
Metamorphic Quartzite
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, typically white to gray or pinkish, vitreous luster, non-foliated massive crystal structure, specific gravity around 2.65.
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Physical properties
Hardness of 7 on Mohs scale, typically white to gray or pinkish, vitreous luster, non-foliated massive crystal structure, specific gravity around 2.65.
Formation & geological history
Formed under high heat and pressure from quartz-rich sandstone during regional metamorphism, often over hundreds of millions of years.
Uses & applications
Used in construction, railroad ballast, decorative aggregate, and occasionally for manufacturing countertops and monuments.
Geological facts
Quartzite is extremely resistant to chemical weathering and erosion, which is why ridges formed of quartzite often persist as high mountain crests.
Field identification & locations
Can be identified by its inability to be scratched by steel and its refusal to fizz with hydrochloric acid. Found globally in ancient mountain belts.
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