sedimentary

Red sandstone fragment

Sandstone, likely quartz-rich ferruginous sandstone

AI-generated identification · may be incorrect

Usually Mohs hardness 6–7 for quartz grains, but porous and friable overall; reddish-brown from iron-oxide cement, dull to earthy luster, granular texture, and no consistent cleavage. Visible bedding or weathering may occur; specific gravity is commonly about 2.2–2.7.

Identified August 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized grains—mostly quartz and feldspar—were deposited, compacted, and cemented, commonly in river, desert, or shallow-marine settings. Its exact geological age cannot be determined from the image and may range from Precambrian to recent.

Uses & applications

Used as building stone, paving, masonry, aggregate, and landscaping material; attractive pieces may be collected, but this fragment has little gem value.

Geological facts

The red color generally reflects hematite or other iron-oxide coatings on grains, indicating oxidation during or after deposition. Sandstone can preserve ripple marks, cross-bedding, fossils, and ancient environmental clues.

Field identification & locations

Identify it by its gritty sand-sized texture, porous surface, layered appearance, and reddish iron staining; a steel nail may scratch weak cement but not individual quartz grains. Common worldwide, especially in sedimentary basins and desert regions.