sedimentary
Weathered sandstone or quartz-rich sedimentary pebble
Indeterminate lithic fragment; likely quartz arenite (sandstone)
AI-generated identification · may be incorrectLight tan, dull to slightly gritty surface with visible granular texture and irregular fracture; estimated Mohs hardness 6–7 if quartz-rich, with no obvious cleavage. Specific gravity likely about 2.5–2.7.
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Physical properties
Light tan, dull to slightly gritty surface with visible granular texture and irregular fracture; estimated Mohs hardness 6–7 if quartz-rich, with no obvious cleavage. Specific gravity likely about 2.5–2.7.
Formation & geological history
Probably a naturally weathered and rounded sedimentary fragment formed from compacted, cemented sand; its geological age and precise formation environment cannot be determined from the photograph.
Uses & applications
Common sandstone is used as building stone, paving, aggregate, and decorative material; this small specimen has mainly educational or modest collecting value.
Geological facts
The image does not show diagnostic fossils, bedding, or crystal faces, so identification is provisional; similar tan pebbles may also be weathered quartzite or limestone.
Field identification & locations
Look for individual sand grains and a scratch-resistant surface for sandstone; quartzite is harder and more sugary-looking, while limestone reacts with dilute acid and is softer. Common in river gravels, beaches, deserts, and sedimentary outcrops.
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