sedimentary
Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
Hardness: 6-7 (Mohs scale); Color: Tan, beige, or greyish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, beige, or greyish-brown
- 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: Tan, beige, or greyish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years. This specific specimen shows signs of mechanical weathering and aqueous erosion, likely from a fluvial (river) environment.
Uses & applications
Used widely in construction as a building stone or road base; if naturally shaped, often collected as a 'pocket stone' or decorative garden rock. Some grooved sandstones are historical artifacts (abraders), though this appears natural.
Geological facts
Sandstone accounts for about 20% of all sedimentary rocks on Earth. Its porosity makes it a valuable reservoir for water, oil, and natural gas. Some grooved specimens were used by indigenous peoples as tools for sharpening bone or wood.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and visible grains. Common in arid environments, riverbeds, and coastal cliffs. Check if grains can be rubbed off to confirm sedimentary nature.
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