sedimentary
Rounded brown pebble, likely sandstone
Quartz-rich sandstone (tentative; image alone cannot confirm composition)
AI-generated identification · may be incorrectOpaque, brown, rounded and fine-grained with a dull, slightly rough surface; likely dominated by quartz grains and cement. Sandstone hardness varies, commonly about 6–7 where quartz-rich; crystal structure is not visible in the rock as a whole.
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Physical properties
Opaque, brown, rounded and fine-grained with a dull, slightly rough surface; likely dominated by quartz grains and cement. Sandstone hardness varies, commonly about 6–7 where quartz-rich; crystal structure is not visible in the rock as a whole.
Formation & geological history
Sand-sized sediment was compacted and cemented, then weathered and rounded during transport by water. Its geological age and exact formation environment cannot be determined from the image.
Uses & applications
Small pebbles are used for landscaping, decorative displays, and collecting; sandstone is also used as building and paving stone.
Geological facts
The smooth, rounded shape usually reflects abrasion during transport or wave action.
Field identification & locations
Look for visible sand grains or gritty texture and test hardness only on an inconspicuous spot; many different rocks can appear similar when weathered. Commonly found in streambeds and beaches.
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