sedimentary

Jasper Conglomerate

Clastic Sedimentary Rock (Conglomeratic Quartzite)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Multi-colored with reddish, brown, and tan clasts; Luster: Dull to earthy; Texture: Coarse-grained clasts in a fine matrix; Cleavage: None.

Hardness: 6
Color: Multi-colored with reddish, brown, and tan clasts
Luster: Dull to earthy

Identified July 14, 2026More sedimentary →

Explore Jasper Conglomerate in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Multi-colored with reddish, brown, and tan clasts; Luster: Dull to earthy; Texture: Coarse-grained clasts in a fine matrix; Cleavage: None.

Formation & geological history

Formed from the lithification of rounded river or beach gravel. The red coloration suggests the presence of iron oxide (hematite) during the deposition and cementation phases.

Uses & applications

Used primarily as decorative stone, in landscaping, and sometimes as a minor gemstone when polished into beads or cabochons.

Geological facts

Conglomerates are 'time capsules' of geological history, as they contain fragments of even older rocks transported by high-energy water environments like fast-moving rivers.

Field identification & locations

Identify by looking for rounded pebbles (clasts) fused together by a finer-grained matrix. Common in ancient riverbeds or alluvial fan deposits worldwide.