sedimentary

Conglomeratic Sandstone

Clastic Sedimentary Rock

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Dark grey with reddish clasts and white quartz grains, Luster: Dull/Earthy, Structure: Granular/Clastic with visible pebbles, Cleavage: None (breaks across grains)

Identified June 22, 2026More sedimentary →

Explore Conglomeratic Sandstone in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-7 (Mohs scale), Color: Dark grey with reddish clasts and white quartz grains, Luster: Dull/Earthy, Structure: Granular/Clastic with visible pebbles, Cleavage: None (breaks across grains)

Formation & geological history

Formed through the accumulation and lithification of sand, pebbles, and mineral particles in high-energy environments like riverbeds or coastal zones. Likely containing hematite or iron oxides giving it the reddish hue.

Uses & applications

Used primarily in construction as road base, concrete aggregate, and sometimes as a building stone. Collectors value specimens with unique inclusions.

Geological facts

This specimen displays a poorly sorted texture, meaning the grains and pebbles are various sizes, which indicates it was deposited quickly by water. It often serves as a reservoir for groundwater or petroleum.

Field identification & locations

Check for a gritty feel like sandpaper and the presence of rounded or sub-angular pebbles embedded in a finer matrix. Common in basin regions and along ancient river paths.