sedimentary

Sandstone (with Chert/Quartzite)

Arenite (SiO2 primarily)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Tan, yellow, brown, and grey; Luster: Dull to earthy; Crystal structure: Granular/Microcrystalline; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, yellow, brown, and grey
Luster: Dull to earthy

Identified June 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, yellow, brown, and grey; Luster: Dull to earthy; Crystal structure: Granular/Microcrystalline; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed via the accumulation and cementation of mineral particles or rock fragments (clasts) such as quartz. High iron oxide content causes the yellowish-brown coloration. Often found in riverbeds or coastal environments.

Uses & applications

Commonly used as a building material, decorative landscaping stone, and in the production of glass or concrete.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. This specific specimen shows signs of water-smoothing, likely from a fluvial (river) environment.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and its ability to scratch glass if quartz-rich. Look for layered structures or rounded 'water-worn' shapes in gravel pits or creek beds.