sedimentary
Sandstone Concretion
Sandstone (Sedimentary rock, mostly SiO2)
Hardness: 6-7 (Mohs), Color: Tan to reddish-brown, Luster: Dull/Earthy, Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 (Mohs), Color: Tan to reddish-brown, Luster: Dull/Earthy, Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the precipitation of mineral cement (often calcite or iron oxide) within the spaces between sediment grains. They are often older than the host rock layers, ranging from thousands to millions of years old.
Uses & applications
Informational/Educational specimens; used smaller-scale for landscaping or as curiosities. High-purity sandstone is used in glass making.
Geological facts
Concretions are often mistaken for fossils, dinosaur eggs, or meteorites due to their unusual round shapes. Some can reach several meters in diameter.
Field identification & locations
Identified by its rounded or spherical shape, granular 'sand' texture, and heavier weight compared to surrounding soil. Often found in riverbeds or eroding cliffs.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary