sedimentary

Sandstone

Arenite (Siliclastic sedimentary rock, primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: tan, yellow, or earthy brown, Luster: Dull/Earthy, Structure: Granular/Clastic with visible sand-sized grains, Specific Gravity: 2.2-2.8

Identified March 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: tan, yellow, or earthy brown, Luster: Dull/Earthy, Structure: Granular/Clastic with visible sand-sized grains, Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (clasts) over millions of years, typically in desert, river, or coastal environments. Found in strata ranging from Precambrian to Holocene eras.

Uses & applications

Extensively used as a building material, road base, and in glass making (if high silica). In the energy sector, it acts as a reservoir rock for oil, natural gas, and groundwater.

Geological facts

Sandstone makes up about 10-25% of the sedimentary rocks on Earth. The vibrant colors in famous landmarks like the Grand Canyon or Petra are primarily due to iron oxides within the sandstone matrix.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layering (bedding). It is found globally in sedimentary basins. Collectors often look for 'Liesegang rings' or fossil inclusions.