sedimentary
Worn River Pebble with Fossil Indentation
Sedimentary Rock with Fossil Infill
Hardness typically 5 to 7 on the Mohs scale depending on the host matrix; brownish-gray color; dull to sub-vitreous luster; amorphous to microcrystalline structure with a smooth, water-worn exterior.
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Physical properties
Hardness typically 5 to 7 on the Mohs scale depending on the host matrix; brownish-gray color; dull to sub-vitreous luster; amorphous to microcrystalline structure with a smooth, water-worn exterior.
Formation & geological history
Formed through sedimentary processes in ancient aquatic environments, followed by prolonged water transport and mechanical weathering in a riverbed.
Uses & applications
Used primarily as an educational specimen for amateur geology, a pocket stone, or a decorative object.
Geological facts
River pebbles often preserve ancient impressions of fossils or differential weathering patterns where softer mineral veins have eroded faster than the surrounding matrix.
Field identification & locations
Found commonly in gravel bars and riverbeds worldwide. Identify by examining the smooth, rounded shape caused by tumbling and searching for embedded fossil structures or mineral inclusions.
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