metamorphic
Quartz-rich rock, likely quartzite
Quartzite, composed predominantly of quartz (SiO₂)
AI-generated identification · may be incorrectPale cream to white, rough and granular with a dull to vitreous luster; quartz hardness is 7 Mohs, and the rock typically has no cleavage. The image alone does not confirm its identity or specific gravity.
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Physical properties
Pale cream to white, rough and granular with a dull to vitreous luster; quartz hardness is 7 Mohs, and the rock typically has no cleavage. The image alone does not confirm its identity or specific gravity.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure, welding quartz grains together. Its age and formation environment cannot be determined from the photograph.
Uses & applications
Quartzite is used as crushed aggregate, building and decorative stone, and sometimes for countertops; this small, unverified specimen has little commercial value.
Geological facts
A diagnostic feature of quartzite is that it tends to fracture through quartz grains rather than around them, unlike many sandstones.
Field identification & locations
Look for a hard, quartz-rich texture and scratch resistance; common sources include metamorphic belts worldwide. Confirm with a hardness test and close inspection, since the pictured specimen could be another pale, quartz-rich rock.
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