sedimentary

Sandstone

Arenite

Hardness: 6-7 on Mohs scale; Color: Tan, brown, or grey; Luster: Dull or earthy; Crystal structure: Clastic (composed of mineral grains); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, brown, or grey
Luster: Dull or earthy

Identified March 11, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, brown, or grey; Luster: Dull or earthy; Crystal structure: Clastic (composed of mineral grains); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments, typically silicate minerals like quartz and feldspar. These particles are deposited in deserts, riverbeds, and ocean floors over millions of years.

Uses & applications

Widely used as a construction material (dimension stone), a source of silica for glass manufacturing, and as a reservoir rock in the petroleum industry for oil and natural gas.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Its porous nature makes it an excellent natural filter for groundwater and a vital aquifer resource.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible layered bedding. It is commonly found in basins and mountain ranges globally. Collectors should look for specimens with interesting ripple marks or cross-bedding features.