sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, buff, or light brown; Luster: Dull to earthy; Structure: Granular/Clastic texture with visible sand-sized grains; Specific gravity: 2.2-2.8.

Hardness: 6-7 on Mohs scale (due to quartz content)
Color: Tan, buff, or light brown
Luster: Dull to earthy

Identified February 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and litification of sand-sized mineral particles or rock fragments. Usually deposited in riverbeds, deserts, or marine environments. This specific specimen appears to be a water-worn river cobble from the Holocene to Pleistocene era.

Uses & applications

Used extensively in construction for building stone, road base, and as an abrasive. High-purity quartz sandstone is used in glass manufacturing.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The famous 'Wave' rock formation in Arizona is a spectacular example of wind-eroded sandstone layers.

Field identification & locations

Field identification: Gritty 'sandpaper' feel when rubbed; visible grains; will not fizz with HCl (unlike limestone). Commonly found in riverbeds, canyons, and coastal outcrops.