sedimentary

Likely sandstone

Quartz-rich sandstone (composition cannot be confirmed from the photo)

AI-generated identification · may be incorrect

Tan to yellow-brown, dull and visibly granular, with uneven fracture and possible bedding or layering. Typical sandstone is Mohs 6–7 for its quartz grains, with no consistent cleavage; the specimen’s grain size and mineral proportions are not clear enough to assess precisely.

Identified October 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed when sand accumulated, compacted, and cemented by silica, calcite, or iron oxides. Its age and depositional setting cannot be determined from appearance alone.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and sometimes as a source or reservoir rock; this small piece appears most suitable for collecting.

Geological facts

Iron-oxide staining commonly gives sandstone yellow, tan, or reddish hues. A close-grained, layered appearance can also resemble other rocks, so identification is provisional.

Field identification & locations

Look for individual sand-sized grains and bedding; a magnifier can help distinguish it from fine-grained siltstone or crystalline rocks. Sandstone occurs widely in sedimentary basins worldwide.