sedimentary

Sandstone (Ferruginous Concretion)

Arenite (with iron oxide cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: tan, brown, yellowish; Luster: dull, earthy; Structure: granular, clastic texture with cementation; Cleavage: none; SG: 2.3-2.6

Hardness: 6-7 (individual grains)
Color: tan, brown, yellowish
Luster: dull, earthy

Identified July 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains); Color: tan, brown, yellowish; Luster: dull, earthy; Structure: granular, clastic texture with cementation; Cleavage: none; SG: 2.3-2.6

Formation & geological history

Formed through the accumulation and compaction of sand-sized mineral particles or rock fragments, cemented together by chemical precipitates like silica or iron oxide. These often form in desert, river, or ocean environments.

Uses & applications

Commonly used in construction as a building material and paving stone. In some cases, it is a source of sand for glass manufacturing or as an aquifer for water/oil.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Famous monuments like the Red Fort and Petra are carved entirely out of sandstone.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Often found in outcrops, riverbeds, and sedimentary basins. Collectors often look for concretions or fossiliferous samples.