sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Hardness: 6-7 (individual grains); Color: Tan, brown, or buff with white quartz highlights; Luster: Dull or earthy matrix with vitreous grains; Structure: Clastic, granular texture; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (individual grains)
Color: Tan, brown, or buff with white quartz highlights
Luster: Dull or earthy matrix with vitreous grains

Identified April 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river beds, deserts, or marine environments. This specimen shows iron-oxide staining typical of terrestrial weathering.

Uses & applications

Used widely as a construction material (stone masonry), road base, and as a reservoir rock for oil and gas in industrial settings.

Geological facts

Sandstone accounts for approximately 10 to 20 percent of the sedimentary rocks on Earth. It is a key rock for identifying ancient environmental conditions like desert dunes or prehistoric coastlines.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and the presence of visible grains. It can be found globally in outcrop formations and riverbanks. Look for layering (bedding) in larger formations.