sedimentary
Gravel and Pebbles
Unconsolidated rock fragments (clastic sediment)
AI-generated identification · may be incorrectVariable hardness (ranging from Mohs 3 to 7 depending on mineral composition like quartz or feldspar), mixed colors including brown, grey, and tan, dull to vitreous luster, various crystal and amorphous structures.
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Physical properties
Variable hardness (ranging from Mohs 3 to 7 depending on mineral composition like quartz or feldspar), mixed colors including brown, grey, and tan, dull to vitreous luster, various crystal and amorphous structures.
Formation & geological history
Formed through the weathering and erosion of pre-existing rocks, subsequently transported and rounded by water, ice, or wind in fluvial, glacial, or marine environments.
Uses & applications
Used extensively in construction, road building, concrete aggregate, and landscaping.
Geological facts
Gravel is classified by grain size according to the Wentworth scale, typically ranging from 2 mm to 64 mm in diameter.
Field identification & locations
Found abundantly in riverbeds, beaches, and glacial deposits worldwide; helpful for geologists in determining ancient river flows and provenance.
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