igneous
Weathered quartz-rich pebble
Likely quartzite or quartz-bearing sandstone; identification is uncertain from the photograph alone
AI-generated identification · may be incorrectPale cream to yellow-beige, dull to slightly granular luster, rounded waterworn form, and apparent iron-oxide staining. Likely hardness about 6.5–7 if quartz-rich; no visible cleavage and low-to-moderate porosity.
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Physical properties
Pale cream to yellow-beige, dull to slightly granular luster, rounded waterworn form, and apparent iron-oxide staining. Likely hardness about 6.5–7 if quartz-rich; no visible cleavage and low-to-moderate porosity.
Formation & geological history
Probably a naturally weathered and transported clast derived from quartzite or sandstone, potentially formed from older sedimentary quartz grains and later cemented or metamorphosed. Its exact geological age and source cannot be determined visually.
Uses & applications
Typically a curiosity or teaching specimen; quartzite may be used as aggregate, riprap, building stone, or paving material, but this small pebble has little industrial value.
Geological facts
The yellow-brown coloration commonly results from hydrated iron oxides such as limonite coating or filling pores. A glassy scratch test can help distinguish quartz-rich rock from softer limestone.
Field identification & locations
Common in stream beds, beaches, glacial deposits, and gravel; likely found wherever resistant quartz-rich rocks erode. Test whether it scratches glass and whether dilute vinegar fizzes—strong fizz would instead suggest limestone.
