sedimentary
Sandstone River Pebble
Arenite (SiO2 predominantly)
Mohs hardness: 6-7; Color: Tan to brown; Luster: Dull/Earthy; Structure: Clastic, fine-grained sand particles; Cleavage: None; Specific Gravity: 2.2-2.8.
- Hardness
- 6-7
- Color
- Tan to brown
- Luster
- Dull/Earthy
Identified More sedimentary →
Explore Sandstone River Pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness: 6-7; Color: Tan to brown; Luster: Dull/Earthy; Structure: Clastic, fine-grained sand particles; Cleavage: None; Specific Gravity: 2.2-2.8.
Formation & geological history
Formed by the accumulation and lithification of sand-sized mineral grains or rock fragments. This specimen was likely shaped and smoothed by fluvial (river) erosion over a long period.
Uses & applications
Commonly used as decorative landscaping stones, aquarium gravel, or as a component in construction aggregates. Generally lacks significant industrial value in pebble form.
Geological facts
Sandstone can vary widely in color based on impurities; iron oxides produce the common tan and reddish hues seen in this specimen. Many river pebbles have traveled miles from their original source rocky outcrop.
Field identification & locations
Identified by its gritty feel (like sandpaper) and visible rounded sand grains. Common in riverbeds, beaches, and glaciated areas. Collectors look for unique shapes or streaks of color.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Brown Sandstone (River Rock)
Arenite
sedimentary
Mudstone
Argillite / Siliciclastic sedimentary rock
sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary