sedimentary

Weathered sandstone

Quartz-rich sandstone, likely ferruginous subarkose

AI-generated identification · may be incorrect

Fine- to medium-grained, tan-brown and rusty from iron oxides; dull to faintly sandy luster, with quartz grains and weak bedding. Hardness is approximately 6–7 for individual quartz grains, while the rock commonly crumbles along weathered surfaces; no obvious cleavage.

Identified September 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand—mostly quartz—was deposited, compacted, and cemented, commonly by silica, calcite, or iron oxides. Its exact geological age cannot be determined from the photograph; weathering has produced the rough, iron-stained surface.

Uses & applications

Used as building stone, paving, aggregate, and occasionally decorative stone; this specimen has mainly educational or modest collecting value.

Geological facts

Rusty coloration typically reflects hematite or limonite cement. Sandstone commonly preserves ripple marks, cross-bedding, channels, and other evidence of ancient rivers, beaches, deserts, or deltas.

Field identification & locations

Identify it by visible sand grains, gritty texture, layered fabric, and lack of strong crystalline interlocking. Common worldwide, especially in sedimentary basins; a hand lens, streak test, and dilute acid test for carbonate cement are useful.