sedimentary

Weathered reddish sandstone fragment

Quartz-rich sandstone, likely ferruginous arkose or litharenite

AI-generated identification · may be incorrect

Hardness about 6–7 for quartz grains; reddish-brown, gritty, dull to weakly sparkling. Composed mainly of sand-sized quartz and feldspar grains cemented by iron oxides and silica; no obvious cleavage, with granular texture and moderate porosity.

Identified September 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when ancient sand accumulated, was compacted, and cemented; the red color reflects oxidation of iron-bearing minerals. Its precise geological age cannot be determined from the photograph.

Uses & applications

Used as building or paving stone, aggregate, and decorative material when sound; this small weathered fragment has mainly educational or modest collecting value.

Geological facts

Iron-oxide cement commonly produces the characteristic red, orange, or brown coloration. Sandstone typically breaks around grain boundaries and feels distinctly rough compared with crystalline rocks.

Field identification & locations

Identify it by visible sand grains, gritty texture, layered or porous structure, and reddish iron staining; common worldwide in sedimentary basins, including Utah, Arizona, Colorado, and many desert regions. A hand lens and dilute acid test (for carbonate cement) would help refine identification.