sedimentary
Rounded sandstone pebble
Quartz-rich sandstone (likely subarkose or quartz arenite)
AI-generated identification · may be incorrectFine-grained, tan, rounded and weakly cemented; dull earthy luster with no visible crystals or cleavage. Typical hardness is about 6–7 for quartz grains, though the whole pebble may scratch or crumble depending on cement.
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Physical properties
Fine-grained, tan, rounded and weakly cemented; dull earthy luster with no visible crystals or cleavage. Typical hardness is about 6–7 for quartz grains, though the whole pebble may scratch or crumble depending on cement.
Formation & geological history
Lithified sand deposited in a river, beach, dune, or shallow-marine environment, then rounded by transport and weathering. Its exact geological age cannot be determined from the image.
Uses & applications
Used mainly as a natural aggregate, landscaping stone, paving material, or educational specimen; generally not suitable as a gemstone.
Geological facts
The rounded shape indicates abrasion during transport or prolonged weathering. Tan coloration commonly comes from iron-oxide coatings or cement between quartz grains.
Field identification & locations
Identify it by its sandpaper-like granular texture, sedimentary layering if present, and lack of interlocking crystals; a glassy streak or acid reaction would suggest a different material. Common worldwide in streambeds, beaches, and sandstone outcrops.
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