sedimentary
Sandstone (likely Arkose)
Arenite (composed mainly of SiO2 with Feldspar)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.2-2.8.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, 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 on Mohs scale; Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.2-2.8.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, often in riverbeds, deltas, or desert environments. This specimen appears to be an arkose sandstone, which forms from the rapid weathering of granitic rocks.
Uses & applications
Used widely in construction for paving, building blocks, and decorative stone. Also used as a reservoir rock for oil and gas or for groundwater aquifers.
Geological facts
Sandstone makes up about 10-25% of the sedimentary rock on Earth. It is famous for creating dramatic landscapes like the Grand Canyon and the red rocks of Sedona.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel. Look for visible layers (bedding) and grains of quartz and feldspar. Found globally in basins and mountainous regions.
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