igneous
Rounded quartz-rich pebble
Likely quartzite or granitoid-derived felsic rock; exact identification is uncertain from the image
AI-generated identification · may be incorrectPale gray-white, rounded and weathered, with a granular texture and dull to slightly glassy luster. Quartz-rich rocks typically have Mohs hardness about 7, no cleavage, and specific gravity around 2.6–2.7; minor dark grains may be mica or other silicates.
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Physical properties
Pale gray-white, rounded and weathered, with a granular texture and dull to slightly glassy luster. Quartz-rich rocks typically have Mohs hardness about 7, no cleavage, and specific gravity around 2.6–2.7; minor dark grains may be mica or other silicates.
Formation & geological history
Likely formed as a durable fragment of quartzite or granite, then naturally rounded by stream or beach abrasion. The original rock may be hundreds of millions to billions of years old, but its present pebble form is much younger.
Uses & applications
Suitable as a decorative or landscaping pebble, paperweight, or teaching specimen; not typically valuable for jewelry or construction in this small form.
Geological facts
Quartz-rich pebbles resist weathering, allowing them to become smoothly rounded while softer minerals wear away. A streak test, hardness test, and close inspection of grain boundaries would improve identification.
Field identification & locations
Common in stream gravels, beaches, glacial deposits, and gravel beds worldwide. If it scratches glass and shows interlocking grains, quartzite is likely; visible feldspar and dark mica suggest granite.
