sedimentary
Conglomerate
Clastic sedimentary rock
AI-generated identification · may be incorrectHardness varies from 6 to 7 for quartz pebbles; colors include brown, tan, and gray; dull luster; clastic texture with rounded gravel-sized fragments in a finer matrix.
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Physical properties
Hardness varies from 6 to 7 for quartz pebbles; colors include brown, tan, and gray; dull luster; clastic texture with rounded gravel-sized fragments in a finer matrix.
Formation & geological history
Formed by the consolidation and cementation of gravel and rounded rock fragments in high-energy environments like rivers or beaches.
Uses & applications
Used primarily in construction, aggregate for road building, and occasionally as decorative facing stone.
Geological facts
Conglomerates are often called puddingstone when the clasts contrast sharply with the matrix color. They provide direct evidence of ancient water energy and transport direction.
Field identification & locations
Identify in the field by visible, rounded pebbles cemented together in a sand or mud matrix. Found worldwide in sedimentary basins and ancient riverbeds.
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Fossiliferous Sedimentary Rock
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Sandstone or Siltstone
Arenite (if sandstone)
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Shale
Shale (clastic sedimentary rock)
sedimentary
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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