sedimentary

Weathered sandstone

Quartz-rich sandstone, likely ferruginous subarkose or arenite

AI-generated identification · may be incorrect

Tan to reddish-brown, fine- to medium-grained, dull earthy luster, and weakly visible bedding or laminations; composed mainly of quartz with feldspar and iron-oxide cement. Typical hardness is about 6–7 for individual grains, but the rock breaks along cemented layers; specific gravity is approximately 2.2–2.6.

Identified August 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated in a river, floodplain, dune, or shallow-marine environment and lithified by compaction and cementation. Its exact geological age cannot be determined from the photograph; iron staining reflects later weathering and oxidation.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and landscaping material; attractive varieties are used for architectural facing and occasional specimen collecting.

Geological facts

The rusty patches are likely hematite or limonite coatings, while the rounded surface and softened edges indicate prolonged weathering. Sandstone commonly preserves ripple marks, cross-bedding, and fossils.

Field identification & locations

Identify it by visible sand-sized grains, gritty texture, tan/red color, and possible layering; it should not fizz strongly with dilute hydrochloric acid. Common worldwide, especially in sedimentary basins and exposed river or desert deposits.