sedimentary

Sandstone (specifically Arkose or Siltstone variant)

Clastic Sedimentary Rock (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, brownish-orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None (conchoidal or irregular fracture); Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, brownish-orange
Luster: Dull/Earthy

Identified June 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brownish-orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None (conchoidal or irregular fracture); Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts). Common in river beds, deserts, and floodplains where sand is deposited and buried over millions of years.

Uses & applications

Widely used in construction for house building, paving, and high-quality artistic sculpture due to its durability and soft initial workable state.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous Red Rocks of Colorado and the city of Petra in Jordan are carved directly into sandstone formations.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible layering (bedding). It can be found globally in outcrop formations and mountainous regions.