sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (Iron-rich)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale), Color: Rusty brown, orange, tan, Luster: Dull to earthy, Structure: Granular/Clastic, Cleavage: None
- Luster
- Dull to earthy, Structure: Granular/Clastic, Cleavage: None
Identified More sedimentary →
Explore Ferruginous Sandstone (River Pebble) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 (Mohs scale), Color: Rusty brown, orange, tan, Luster: Dull to earthy, Structure: Granular/Clastic, Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, subsequently stained or cemented by iron oxides (like hematite or limonite). Rounded by river or water transport.
Uses & applications
Primarily used as decorative landscaping stone, aquarium rocks, or architectural aggregate; historically used as low-grade iron ore.
Geological facts
The distinct orange-brown color is due to the oxidation of iron minerals within the rock, essentially 'rusting' the stone over time.
Field identification & locations
Identify by the gritty texture of sand grains and the characteristic rusty staining. Found in riverbeds, glacial deposits, and sedimentary basins globally.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary