sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, likely ferruginous sandstone

AI-generated identification · may be incorrect

Approximate hardness 6–7 where quartz-rich; orange-tan color, dull to slightly gritty luster, and granular texture. The iron-oxide staining produces the rusty color; individual grains and bedding are faintly visible, with no obvious crystal cleavage.

Identified August 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized quartz and rock fragments were compacted and cemented, commonly by silica or iron oxides; its exact geological age cannot be determined from the image. Orange weathering reflects oxidation of iron-bearing minerals or cement.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and monuments; this small fragment has mainly educational or modest collecting value.

Geological facts

Sandstone color can change dramatically with cement type: hematite commonly creates red-orange tones, while silica cement produces a harder, more resistant rock.

Field identification & locations

Identify it by its gritty sand grains, relatively uniform sedimentary texture, and ability to scratch glass if quartz-rich; acid testing is usually negative. Common worldwide, especially in sedimentary basins and exposed cliffs.