sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
Hardness: 6-7 (Mohs scale); Color: Brown, reddish-tan, or orange; Luster: Dull/Earthy; Crystal Structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Brown, reddish-tan, or orange
- 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 scale); Color: Brown, reddish-tan, or orange; Luster: Dull/Earthy; Crystal Structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral particles or rock fragments. The brown coloration suggests iron-oxide (hematite or limonite) acting as the cementing agent. Commonly found in riverbeds, deserts, or ancient ocean basins.
Uses & applications
Used primarily in construction for paving, building stone, and glass manufacturing if pure quartz. Historically used for grindstones.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. It is an excellent aquifer because it is often porous enough to store large amounts of water.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Commonly found in stratified layers in canyons or road cuts. Collectors look for unique banding or fossils.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary