metamorphic
Weathered quartz-rich pebble
Likely quartzite (mostly SiO₂); identification is tentative from the photo
AI-generated identification · may be incorrectTan-gray, dull to slightly sparkly, with a granular, compact texture and rounded weathered surfaces. Quartz has Mohs hardness 7 and no cleavage; a quartzite pebble should resist scratching by a steel knife.
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Physical properties
Tan-gray, dull to slightly sparkly, with a granular, compact texture and rounded weathered surfaces. Quartz has Mohs hardness 7 and no cleavage; a quartzite pebble should resist scratching by a steel knife.
Formation & geological history
If quartzite, it formed when quartz sandstone was cemented and recrystallized during metamorphism; its age and source cannot be determined from the image. The rounded shape suggests transport and abrasion in water or sediment.
Uses & applications
Commonly used as decorative landscaping stone and aggregate; this small pebble has little commercial value.
Geological facts
Quartzite can resemble sandstone, but its quartz grains are tightly interlocked and it typically breaks through grains rather than around them.
Field identification & locations
Look for hardness, a gritty or sparkling quartz-rich surface, and lack of layering; similar pebbles occur in river and beach gravels worldwide. A closer view or simple hardness test would help distinguish quartzite from sandstone or another weathered rock.
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