metamorphic
Rounded brown river pebble, likely quartzite
Quartzite (predominantly recrystallized quartz, SiO₂); identification is tentative from the image
AI-generated identification · may be incorrectSmooth, rounded, tan-to-brown surface with pale vein-like markings; likely Mohs hardness about 7 and a vitreous to dull luster. Grain size and crystal structure are not clear enough to confirm quartzite versus another hard silicate rock.
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Physical properties
Smooth, rounded, tan-to-brown surface with pale vein-like markings; likely Mohs hardness about 7 and a vitreous to dull luster. Grain size and crystal structure are not clear enough to confirm quartzite versus another hard silicate rock.
Formation & geological history
Likely rounded by water or shoreline abrasion; if quartzite, it formed when quartz-rich sandstone was metamorphosed under heat and pressure. Its age and source cannot be determined from the photograph.
Uses & applications
Suitable for collecting, landscaping, or decorative use; quartzite is also used as aggregate and building stone.
Geological facts
The rounded shape records abrasion during transport, while the pale streak may be a quartz vein or a surface mark.
Field identification & locations
Look for a hard, scratch-resistant stone with interlocking quartz grains; a steel nail should not readily scratch quartzite. Similar pebbles occur in riverbeds and on beaches worldwide.
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