sedimentary

Sandstone (Quartzose)

Arenite (SiO2 based)

Hardness: 6-7 on Mohs scale; Color: Tan, brown, or reddish due to iron oxides; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic texture; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, brown, or reddish due to iron oxides
Luster: Dull/Earthy

Identified June 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, brown, or reddish due to iron oxides; Luster: Dull/Earthy; Crystal Structure: Granular/Clastic texture; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments (clasts) usually by silica, calcium carbonate, or iron oxide. Typical of ancient riverbeds, beaches, or desert dunes.

Uses & applications

Commonly used as a masonry material in construction, for making grindstones, as a reservoir rock in the petroleum industry, and for decorative stone in landscaping.

Geological facts

Sandstone is one of the most common sedimentary rocks on Earth. The famous Red Rocks Amphitheatre in Colorado and the Treasury at Petra are both carved into sandstone formations.

Field identification & locations

Identify by its 'sandpaper' feel and visible grains. It can be found globally in outcrop formations and riverbeds. For collectors, look for cross-bedding patterns or fossils often preserved within.