igneous
Weathered quartz-rich pebble
Likely quartzite or quartz-bearing granitoid; exact identification requires testing
AI-generated identification · may be incorrectPale tan, rounded, dull to weakly waxy luster, fine-grained and massive, with no visible cleavage; likely hardness about 6.5–7 Mohs and specific gravity roughly 2.6–2.7.
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Physical properties
Pale tan, rounded, dull to weakly waxy luster, fine-grained and massive, with no visible cleavage; likely hardness about 6.5–7 Mohs and specific gravity roughly 2.6–2.7.
Formation & geological history
Probably a river- or beach-rounded fragment formed by erosion of quartzite or granitic rock; its precise geological age and source cannot be determined from the photograph.
Uses & applications
Primarily a natural pebble or teaching/collecting specimen; quartzite can be used as aggregate, building stone, and ornamental stone, while this small piece has negligible commercial use.
Geological facts
The rounded shape and dark weathering spots indicate transport and surface alteration rather than crystal growth in its present form.
Field identification & locations
Look for glassy quartz grains, inability to scratch it with a steel knife, and resistance to dilute acid; a streak, hardness, magnetism, and close-up texture would help distinguish quartzite from granite or chert. Common in stream gravels worldwide.
