sedimentary

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brownish-tan to reddish-brown; Luster: Dull to earthy (when dry); Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Brownish-tan to reddish-brown
Luster: Dull to earthy (when dry)

Identified March 22, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brownish-tan to reddish-brown; Luster: Dull to earthy (when dry); Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (lithification). This specimen appears to be a water-worn river stone or beach pebble, indicating significant mechanical weathering over thousands of years.

Uses & applications

Used extensively in construction as a building material, for paving stones, and in the production of glass. It is also an important reservoir rock for groundwater and petroleum.

Geological facts

Sandstone makes up about 10-20% of the Earth's sedimentary rocks. Famous landmarks like the Grand Canyon and the city of Petra are carved from or composed of massive sandstone layers.

Field identification & locations

Identify in the field by its gritty 'sandpaper' feel and visible grains. Often found in riverbeds, deserts, and coastal areas. Collectors look for unique banding or fossil inclusions.