sedimentary

Sandstone Pebble

Arenite (predominantly SiO2)

Mohs hardness of 6-7, dull earthy luster, tan to brownish color with a gritty, fine- to medium-grained clastic texture.

Identified October 9, 2026More sedimentary →

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Physical properties

Mohs hardness of 6-7, dull earthy luster, tan to brownish color with a gritty, fine- to medium-grained clastic texture.

Formed by the compaction and cementation of mineral particles and rock fragments, commonly weathered into rounded pebbles by fluvial processes.

Commonly used in landscaping, garden mulching, aggregate for construction, and decorative ground cover.

Sandstone is one of the most common sedimentary rock types, comprising roughly 20 to 25 percent of all sedimentary rocks on Earth.

Identified by its sandy, gritty feel and rounded pebble shape, typically gathered from riverbeds or quarries for landscaping.

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)