sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains), but overall friable; Color: Tan to reddish-brown; Luster: Dull/Earthy; Structure: Clastic, granular texture; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (individual grains), but overall friable
Color: Tan to reddish-brown
Luster: Dull/Earthy

Identified April 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains), but overall friable; Color: Tan to reddish-brown; Luster: Dull/Earthy; Structure: Clastic, granular texture; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and lithification of sand-sized mineral grains (mostly quartz) in environments like deserts, riverbeds, or beaches. The reddish tint suggests oxidation of iron minerals during or after deposition.

Uses & applications

Commonly used as a building material, in glass manufacturing, and as a reservoir rock for oil and natural gas. Smaller specimens are typical for educational collections.

Geological facts

Sandstone can preserve fossil footprints and ripple marks from ancient water currents. It makes up approximately 20-25% of all sedimentary rocks on Earth.

Field identification & locations

Identify by its 'sandpaper' feel and visible grains. It can often be scratched with a steel blade or will crumble slightly under pressure if poorly cemented. Found globally in sedimentary basins.