sedimentary
Common Pebble / Sedimentary Rock Fragment
Lithified clastic sediment
Hardness varies (typically 6-7 on Mohs scale if quartz-rich), gray to brownish color, dull to earthy luster, cryptocrystalline or microcrystalline structure, no distinct cleavage.
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Physical properties
Hardness varies (typically 6-7 on Mohs scale if quartz-rich), gray to brownish color, dull to earthy luster, cryptocrystalline or microcrystalline structure, no distinct cleavage.
Formation & geological history
Formed through the weathering, erosion, transportation, and deposition of pre-existing rocks, followed by compaction and cementation (lithification) over millions of years.
Uses & applications
Used primarily in landscaping, road construction, concrete aggregate, and general geological education.
Geological facts
Pebbles like this are often rounded by the abrasive action of water in rivers, streams, or high-energy beach environments over long periods.
Field identification & locations
Found ubiquitously in stream beds, riverbanks, and glacial drift. Collectors typically overlook common small pebbles unless they contain interesting fossils or mineral inclusions.
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