sedimentary

Conglomerate

Clastic sedimentary rock (Psephite)

AI-generated identification · may be incorrect

Hardness: variable (6-7 for matrix depending on silica); Color: grey matrix with pink and dark grey inclusions; Luster: dull to earthy; Texture: coarse-grained clastic with rounded clasts; Cleavage: none.

Hardness: variable (6-7 for matrix depending on silica)
Color: grey matrix with pink and dark grey inclusions
Luster: dull to earthy

Identified June 17, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by the lithification of rounded gravel and pebbles, typically in high-energy environments like riverbeds or alluvial fans. This specimen likely dates from the Phanerozoic eon.

Uses & applications

Used primarily as coarse aggregate in the construction industry for concrete and road fill; sometimes used as decorative stone in landscaping.

Geological facts

Conglomerates are essentially 'nature's concrete.' The rounding of the stones inside indicates they were transported a significant distance by water before being buried and cemented.

Field identification & locations

Identify by looking for rounded pebbles (clasts) larger than 2mm embedded in a finer-grained matrix. Commonly found in old river basins, shorelines, and glacier outwash plains.