sedimentary

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: Tan to yellowish-orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (individual grains)
Color: Tan to yellowish-orange
Luster: Dull/Earthy

Identified June 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains); Color: Tan to yellowish-orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral particles or rock fragments. The orange-brown color is due to iron oxide staining (rust) from groundwater infiltration, common in terrestrial and near-shore environments over millions of years.

Uses & applications

Used primarily as a construction material, for road base, or as an ornamental stone in landscaping and aquariums.

Geological facts

Sandstone accounts for approximately 10% to 25% of the earth's sedimentary rock. The distinct bands of color, often called 'Liesegang rings,' are caused by the precipitation of chemicals from saturated fluids moving through the rock.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible sand grains. It is extremely common in desert environments and riverbeds worldwide. Collectors look for unique banding patterns.