sedimentary

Weathered sandstone boulder

Quartz-rich sandstone (composition and exact variety cannot be confirmed from the image)

AI-generated identification · may be incorrect

Tan to brown, dull and granular, with visible sand-sized grains; typically Mohs 6–7 for quartz grains, though cement strength varies. Individual grains are commonly quartz, with possible feldspar and iron-oxide staining; sandstone has no single crystal structure or cleavage.

Identified September 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was compacted and cemented, often in river, beach, or desert settings. Its age cannot be determined from the photograph.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and landscaping material; this rough boulder has little evident commercial value.

Geological facts

The angular shape and rough, granular surface are consistent with sandstone, but a photograph cannot establish its exact composition or distinguish it reliably from some other granular rocks.

Field identification & locations

Look for gritty sand-sized grains and layered bedding; quartz-rich sandstone commonly occurs in sedimentary basins worldwide. A hand lens and fresh broken surface can help confirm the identification.