sedimentary

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone (SiO₂), possibly weakly metamorphosed to quartzite

AI-generated identification · may be incorrect

Tan-brown, granular, dull to slightly earthy luster, with apparent sedimentary texture and iron-oxide staining. Quartz-rich sandstone typically has Mohs hardness 6–7, no cleavage, and specific gravity around 2.2–2.7; the image is insufficient for a definitive diagnosis.

Identified September 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from compacted and cemented quartz sand, with brown coloration from limonite/goethite; if quartzite, later heat and pressure recrystallized the sandstone. The exact geological age and locality cannot be determined from the photograph.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and landscaping; attractive pieces may be collected or carved. Quartzite is more durable and can be used for countertops, construction aggregate, and decorative stone.

Geological facts

The rounded, worn shape suggests natural weathering or human handling. Iron oxides commonly produce yellow, ochre, and rusty-brown colors in porous quartz-rich rocks.

Field identification & locations

Look for visible sand grains and grains that scratch glass but are bound by a softer cement for sandstone; quartzite appears more fused and sugary, with fractures crossing grains. A fresh surface, streak test, and hardness test would improve identification.