Sandstone

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

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.

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

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

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.