sedimentary

Sandstone

Arenite (SiO2 primarily)

AI-generated identification · may be incorrect

Mohs hardness: 6-7 (if silica-cemented); Color: Tan, brownish-grey, or reddish; Luster: Dull/Earthy; Structure: Granular, clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (if silica-cemented)
Color: Tan, brownish-grey, or reddish
Luster: Dull/Earthy

Identified June 18, 2026More sedimentary →

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Physical properties

Mohs hardness: 6-7 (if silica-cemented); Color: Tan, brownish-grey, or reddish; Luster: Dull/Earthy; Structure: Granular, clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral grains or rock fragments, typically through the process of lithification in river, desert, or marine environments. The coordinates provided in Somalia/Somaliland are rich in Jurassic to Cretaceous sedimentary sequences like the Adigrat Sandstone.

Uses & applications

Construction material, architectural stone, grindstones, and a reservoir for water and oil in geological subsurface formations.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. Its porosity makes it a critical aquifer for groundwater storage.

Field identification & locations

Field identification involves the 'gritty' feel like sandpaper and the visibility of small individual sand grains. It is extremely common in the Horn of Africa's sedimentary basins.