sedimentary

Conglomerate

Conglomerate (sedimentary clastic rock)

AI-generated identification · may be incorrect

Hardness: variable depending on clast composition; Color: grey, tan, brown; Luster: earthy/dull; Structure: clastic texture with rounded gravel-sized fragments; Cleavage: none.

Hardness: variable depending on clast composition
Color: grey, tan, brown
Luster: earthy/dull

Identified July 19, 2026More sedimentary →

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Physical properties

Hardness: variable depending on clast composition; Color: grey, tan, brown; Luster: earthy/dull; Structure: clastic texture with rounded gravel-sized fragments; Cleavage: none.

Formation & geological history

Formed by the lithification of rounded water-worn gravel and pebbles, typically in high-energy environments such as riverbeds, alluvial fans, or beaches. Ages range from Precambrian to recent deposits.

Uses & applications

Used primarily as coarse aggregate in the construction industry and for ornamental stone in facades or landscaping.

Geological facts

Conglomerates are often called puddingstones because the rounded pebbles look like raisins in a pudding. They signify ancient high-energy water transport systems.

Field identification & locations

Identify by looking for rounded, smooth pebbles larger than 2mm cemented in a finer matrix (sand or silt). Commonly found in areas with history of mountain erosion or ancient river deltas.