metamorphic
Quartzite
Metamorphic Quartz Arenite
AI-generated identification · may be incorrectMohs hardness 7, typically white to pink or gray, vitreous luster, non-foliated massive crystal structure, specific gravity around 2.65.
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Physical properties
Mohs hardness 7, typically white to pink or gray, vitreous luster, non-foliated massive crystal structure, specific gravity around 2.65.
Formation & geological history
Formed from quartz-rich sandstone subjected to intense heat and pressure during tectonic compression over millions of years.
Uses & applications
Used widely in construction as crushed stone, railroad ballast, dimension stone, and for manufacturing silica brick.
Geological facts
Quartzite is exceptionally durable and weather-resistant, frequently forming prominent mountain ridges because it erodes slower than surrounding rocks.
Field identification & locations
Identify in the field by its sugary texture on broken surfaces and inability to be scratched by a steel knife.
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