sedimentary

Rounded weathered stone, likely sandstone or iron-stained quartzite

Indeterminate; probable quartz-rich sandstone (SiO₂-dominant)

AI-generated identification · may be incorrect

Tan-brown, fine-grained, dull to slightly earthy luster, smoothly water-worn, with mottled iron-oxide staining. Quartz-rich sandstone typically has Mohs hardness 6–7, poor cleavage, and specific gravity around 2.2–2.7; the image is insufficient for definitive identification.

Identified August 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely a naturally rounded cobble produced by stream or beach abrasion, with iron-rich weathering. The original sedimentary rock may be hundreds of millions of years old, but its exact age and formation environment cannot be determined visually.

Uses & applications

Primarily a landscaping, craft, or collecting stone; not usually valuable for construction or jewelry unless it proves to be unusually hard, decorative quartzite.

Geological facts

The smooth elliptical shape indicates prolonged transport or tumbling. Brown coloration commonly comes from hematite or limonite coating and staining the pore spaces.

Field identification & locations

Look for visible sand grains and easy scratching with a steel nail (sandstone) versus a very hard, interlocking quartz texture (quartzite); dilute acid is generally nonreactive. Common in riverbeds, beaches, gravel deposits, and glacial tills.