sedimentary

Weathered sandstone fragment

Quartz-rich clastic sandstone, likely ferruginous sandstone

AI-generated identification · may be incorrect

Fine- to medium-grained, tan-gray rock with rusty orange iron-oxide staining and a dull, earthy luster; likely Mohs hardness about 6–7 for the quartz grains, but friable overall. The image does not clearly show bedding, fossils, or crystal cleavage.

Identified September 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was compacted and cemented by silica, iron oxides, or carbonate in a sedimentary basin; its exact geological age cannot be determined from the photograph. Surface rounding and discoloration indicate prolonged weathering and erosion.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and occasionally sculpture; this small weathered fragment has little practical value. It is not suitable for jewelry unless unusually patterned or fossil-bearing.

Geological facts

The orange-brown coloration commonly comes from hematite or limonite coatings between quartz grains. Its irregular shape and weathered rind may reflect transport in a stream, glacial sediment, or soil.

Field identification & locations

Look for visible sand-sized grains, gritty texture, weak layering, and a lack of interlocking crystals; a steel nail may scratch softer cement but generally not quartz grains. Common worldwide, especially in sedimentary basins and eroded outcrops.