sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, possibly ferruginous sandstone

AI-generated identification · may be incorrect

Fine-grained, reddish-brown and dull to slightly earthy; likely composed mainly of quartz with feldspar, clay minerals, and iron-oxide cement. Hardness is roughly 6–7 for quartz grains, but the rock may scratch unevenly; no visible cleavage or crystals, and specific gravity is approximately 2.2–2.7.

Identified August 31, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized grains accumulated, compacted, and cemented in a sedimentary environment; the red color commonly reflects oxidation of iron. Its precise geological age and formation location cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally decorative material. This small weathered fragment has little commercial or collector value.

Geological facts

The rounded, smoothed edges suggest abrasion or weathering, possibly from a stream, beach, or landscaping material. Surface texture and color alone cannot reliably distinguish sandstone from some iron-stained volcanic or metamorphic rocks.

Field identification & locations

Look for visible sand grains, gritty texture, layered bedding, and weak acid reaction; a hand lens is useful. Common worldwide, especially in sedimentary basins; a local geological context or fresh broken surface would improve identification.