sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock pebble
Hardness varies generally around 6-7 on Mohs scale depending on mineral content; color is greyish-green with dark spots; luster is dull; amorphous to microcrystalline structure.
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Physical properties
Hardness varies generally around 6-7 on Mohs scale depending on mineral content; color is greyish-green with dark spots; luster is dull; amorphous to microcrystalline structure.
Formation & geological history
Formed through the mechanical weathering and transport of larger parent rocks, often rounded by water action in rivers or shorelines over geological time.
Uses & applications
Commonly used in landscaping, road construction, concrete aggregate, or as a generic specimen for basic educational geology.
Geological facts
Small pebbles like this represent the end-products of the rock cycle, having undergone mechanical abrasion during transport by wind, ice, or water.
Field identification & locations
Found abundantly in riverbeds, beaches, and glacial till worldwide. Identification in the field relies on assessing hardness, scratch tests, and local geological context.
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