sedimentary

Fine-grained sedimentary rock (likely sandstone)

Quartz-rich sandstone; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Tan, rough, and granular with a gray-green patch; likely composed mainly of quartz grains cemented together. Typical sandstone hardness is about 6–7 Mohs, with no distinct cleavage and variable specific gravity around 2.2–2.7.

Identified October 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as sand accumulated and was compacted and cemented; its age and depositional environment cannot be determined from the photo.

Uses & applications

Common sandstone is used as building or paving stone and as a source of sand; this small fragment has little practical or commercial value.

Geological facts

The greenish area may reflect mineral staining or a different cement, but color alone cannot identify its composition.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; sandstone is widespread in sedimentary basins worldwide. A hand lens and streak or hardness tests can help distinguish it from other rocks.