sedimentary

Conglomerate

Conglomerate Sedimentary Rock

Hardness: 6-7 (driven by quartz inclusions); Color: Multi-colored with red, white, tan, and orange; Luster: Dull/Earthy matrix with Vitreous clasts; Structure: Clastic with rounded grains/pebbles larger than 2mm.

Hardness: 6-7 (driven by quartz inclusions)
Color: Multi-colored with red, white, tan, and orange
Luster: Dull/Earthy matrix with Vitreous clasts

Identified July 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in high-energy environments like riverbeds or alluvial fans where water current is strong enough to transport large pebbles. The rounded shape suggests significant travel before deposition and cementation.

Uses & applications

Used primarily in the construction industry as coarse aggregate for concrete and roadbeds. Some attractive specimens are used as decorative stones or for teaching geology.

Geological facts

Conglomerates are often referred to as 'puddingstone' in some regions, particularly in the UK and parts of North America. They serve as a geological record of ancient river systems.

Field identification & locations

Identify by looking for rounded pebbles (clasts) naturally cemented together. Common in sedimentary basins worldwide. This specific specimen shows iron staining and quartz clasts.