Conglomerate

Physical Properties

Hardness: 6-7 (Mohs scale), Color: Brown/Grey/Buff, Luster: Dull/Earthy, Crystal Structure: Clastic (matrix-supported pebbles), Specific Gravity: 2.6-2.8

Formation & Geological History

Formed in high-energy environments like riverbeds or alluvial fans where water currents were strong enough to transport large pebbles. Geological age varies widely by location.

Uses & Applications

Used primarily as coarse aggregate in the construction industry for concrete and road building. Occasionally used as a decorative stone if colorful.

Geological Facts

Conglomerates are often dubbed 'pudding stones' due to their appearance. They are excellent indicators of ancient river systems and paleo-environments.

Field Identification & Locations

Identify in the field by looking for rounded rock fragments (clasts) larger than 2mm cemented together. Found in sedimentary basins worldwide. Good for tracking tectonic activity histories.

Identified on: 5/9/2026

Mode: Standard