sedimentary

Likely weathered sandstone or iron-rich sedimentary rock

Quartz-rich sandstone, possibly ferruginous sandstone

AI-generated identification · may be incorrect

Brown-tan, dull and earthy, with a rough granular texture and apparent weak cementation; likely Mohs hardness about 6–7 for quartz grains but may crumble where weathered. No clear crystal faces or cleavage are visible; specific gravity is commonly 2.2–2.7.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized quartz and rock fragments were deposited, compacted, and cemented, typically in river, shoreline, or desert environments. Its precise geological age cannot be determined from the photograph.

Uses & applications

Usually used as building or paving stone when sound; small pieces have little commercial value but may be collected as geological specimens or jewelry curiosities.

Geological facts

The rusty coloration commonly comes from iron-oxide coatings or cement. The visible graininess and irregular weathering distinguish it from most crystalline minerals.

Field identification & locations

Look for individual sand grains, uneven fracture, and a lack of cleavage; a streak test, dilute acid test, and hand lens would improve identification. Sandstone occurs worldwide, especially in sedimentary basins.