sedimentary
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
Composed of mixed mineral fragments primarily quartz, feldspar, and rock fragments. Variable hardness ranging from 6 to 7 on the Mohs scale depending on specific pebble composition. Mixed colors including tan, brown, gray, and white. Dull to vitreous luster.
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Physical properties
Composed of mixed mineral fragments primarily quartz, feldspar, and rock fragments. Variable hardness ranging from 6 to 7 on the Mohs scale depending on specific pebble composition. Mixed colors including tan, brown, gray, and white. Dull to vitreous luster.
Formation & geological history
Formed through the physical weathering and erosion of pre-existing rocks, followed by the transport and deposition by water in rivers, streams, or glacial environments.
Uses & applications
Widely used in construction as aggregate for concrete, road base, asphalt, and general landscaping.
Geological facts
Gravel deposits often accumulate in riverbeds and glacial outwash plains, acting as natural water filters.
Field identification & locations
Found worldwide in riverbeds, beaches, and quarries; identified by loose, granular mixtures of small rock fragments and pebbles.
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