sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: Tan, beige, grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (individual grains)
Color: Tan, beige, grey
Luster: Dull/Earthy

Identified April 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains); Color: Tan, beige, grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (0.06 to 2 mm diameter) in environments such as deserts, river beds, or beaches. It is lithified by minerals like silica or calcium carbonate over millions of years.

Uses & applications

Widely used as a construction material (dimension stone), in the manufacture of glass, for road base, and as decorative landscaping stone. It is also an important reservoir rock for oil, gas, and groundwater.

Geological facts

Sandstone accounts for approximately 20% of all sedimentary rocks on Earth. Familiar landmarks like the Grand Canyon exhibit massive layers of sandstone that represent ancient environments spanning hundreds of millions of years.

Field identification & locations

Identify it by its gritty, sandpaper-like feel. It can be found globally in outcrop areas, old riverbeds, and coastal regions. Collectors should look for unique cross-bedding patterns or fossil inclusions.