sedimentary
Gravel
Unconsolidated rock fragments / detrital sediment
Mohs hardness varies depending on mineral content (typically 6-7 if quartz-rich); color varies from brown, tan, grey to multicolored; luster ranges from dull to vitreous; heterogeneous mixture of mineral and rock fragments.
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Physical properties
Mohs hardness varies depending on mineral content (typically 6-7 if quartz-rich); color varies from brown, tan, grey to multicolored; luster ranges from dull to vitreous; heterogeneous mixture of mineral and rock fragments.
Formation & geological history
Formed through the weathering and erosion of pre-existing rocks, followed by transport and rounding by water, ice, or wind in fluvial, glacial, or coastal environments.
Uses & applications
Widely used in construction, road base, concrete production, landscaping, and drainage applications.
Geological facts
Gravel is classified by particle size ranging from granules (2mm) to boulders, with standard gravel commonly falling into the pebble size range (4mm to 64mm).
Field identification & locations
Found worldwide in river beds, beaches, glacial deposits, and quarries; easily identified in the field as loose collections of rounded or angular rock fragments.
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