sedimentary

Sandstone with Iron Staining

Arenite with Limonite/Hematite inclusions (SiO2 + Fe2O3/FeO(OH))

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale (granules); Color: Tan, beige, and reddish-brown; Luster: Dull/Earthy; Texture: Granular/Clastic with visible oxidation rinds; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale (granules)
Color: Tan, beige, and reddish-brown
Luster: Dull/Earthy

Identified July 5, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale (granules); Color: Tan, beige, and reddish-brown; Luster: Dull/Earthy; Texture: Granular/Clastic with visible oxidation rinds; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments of sand size, typically in riverbeds, deserts, or coastal environments. The reddish hue indicates secondary oxidation of iron minerals within the pore spaces.

Uses & applications

Commonly used in construction as building stone, road base, and in the production of glass (if high silica). Frequently used as decorative landscaping rock.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The 'rusty' color is caused by the weathering of iron-bearing minerals that act as a natural cement between the quartz grains.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and visible layers or uniform grain size. Found globally in basins and mountainous regions where ancient sedimentary layers have been uplifted.