sedimentary

Sandstone (Red Sandstone)

Arenite (predominantly SiO2 with Fe2O3 cement)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: Reddish-pink to brownish-orange, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8

Identified June 9, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Reddish-pink to brownish-orange, Luster: Dull/Earthy, 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, typically in desert or river environments. The red color is caused by iron oxide (hematite) coating the grains.

Uses & applications

Used widely as a building material, paving stone, decorative garden rock, and sometimes in sculpture due to its ease of masonry.

Geological facts

Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. The famous 'Red Rocks' of the American Southwest are primarily composed of this type of stone.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and mountainous regions. Collectors should look for unique layering (cross-bedding) or fossil inclusions.