sedimentary

Sandstone (with Iron Oxidation)

Arenite (SiO2 with Fe-oxides)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: tan, white, brown with rusty orange/red banding, Luster: dull to earthy, Crystal Structure: clastic (granular), Specific Gravity: 2.2-2.8

Identified July 1, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: tan, white, brown with rusty orange/red banding, Luster: dull to earthy, Crystal Structure: clastic (granular), Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically within river, desert, or marine environments. The visible banding suggests distinct depositional events or mineral leaching over geological time.

Uses & applications

Commonly used as a building material in masonry, paving slabs, and as an abrasive in tool sharpening. It is also an important reservoir rock for groundwater and petroleum.

Geological facts

Sandstone constitutes about 20-25% of all sedimentary rocks on Earth. The red/orange bands are caused by the presence of hematite or limonite (iron oxides) acting as a natural cement.

Field identification & locations

Identify by its 'sandpaper' texture and visible layering (stratification). Look for it in canyons, riverbeds, and cliffs. It will often feel gritty to the touch and can be easily scratched by a steel nail if the cement is weak.