sedimentary
Conglomerate
Clastic Sedimentary Rock
AI-generated identification · may be incorrectHardness varies by clast composition (typically Mohs 6-7), multicolored matrix with rounded pebbles, dull to earthy luster, massive crystal structure with no distinct cleavage, specific gravity around 2.5-2.7.
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Physical properties
Hardness varies by clast composition (typically Mohs 6-7), multicolored matrix with rounded pebbles, dull to earthy luster, massive crystal structure with no distinct cleavage, specific gravity around 2.5-2.7.
Formation & geological history
Formed by the consolidation and cementation of gravel and rounded rock fragments, often deposited by high-energy water currents in riverbeds or alluvial fans.
Uses & applications
Used primarily in the construction industry as crushed aggregate for road building and concrete production.
Geological facts
Conglomerates are often referred to as 'puddingstone' when the matrix and clasts have contrasting colors. The rounded nature of the pebbles indicates they traveled a significant distance in water before deposition.
Field identification & locations
Identified easily in the field by its distinct 'gravel embedded in cement' texture. Found worldwide in ancient and modern sedimentary basins.
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