metamorphic
Quartzite
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectTan-gray, coarse, granular specimen with a dull to slightly sparkly luster; quartz hardness is 7 Mohs, with no cleavage and irregular fracture. The image does not show enough detail to confirm its composition or crystal texture conclusively.
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Physical properties
Tan-gray, coarse, granular specimen with a dull to slightly sparkly luster; quartz hardness is 7 Mohs, with no cleavage and irregular fracture. The image does not show enough detail to confirm its composition or crystal texture conclusively.
Formation & geological history
Forms when quartz-rich sandstone is recrystallized by heat and pressure, commonly during regional metamorphism; age depends on the source rock and metamorphic event.
Uses & applications
Used as building and decorative stone, aggregate, and sometimes in landscaping or collectors’ displays.
Geological facts
Quartzite is typically very hard; in genuine quartzite, grains are tightly fused and the rock tends to fracture through grains rather than around them.
Field identification & locations
Look for a hard, quartz-rich texture and scratch resistance, but visual identification alone is uncertain; quartzite occurs worldwide in metamorphic terrains. A small common specimen like this is roughly $2–$15 USD.
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