sedimentary
Sandstone Pebble
Arenite (SiO2 with various cementing agents)
Hardness: 6-7 (Mohs); Color: Tan, brownish-yellow, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic granular; Cleavage: None; Specific Gravity: 2.2-2.8.
- Hardness
- 6-7 (Mohs)
- Color
- Tan, brownish-yellow, or buff
- Luster
- Dull/Earthy
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, brownish-yellow, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic granular; Cleavage: None; Specific Gravity: 2.2-2.8.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains (primarily quartz or feldspar) over millions of years. This specimen shows significant rounding typical of transport in water (fluvial or beach environments).
Uses & applications
Commonly used as construction aggregate, decorative landscaping stone, and in glass manufacturing if the quartz content is high. Small pebbles are often used in aquariums or garden paths.
Geological facts
Sandstone represents about 20-25% of all sedimentary rocks on Earth. Its porosity makes it one of the most important reservoir rocks for groundwater, petroleum, and natural gas.
Field identification & locations
Identify by the gritty sand-paper feel and visible grains under a hand lens. Commonly found in riverbeds, beaches, and sedimentary basins worldwide. This specimen is a water-worn clast.
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