sedimentary

Quartz-rich sandstone (likely arkosic sandstone)

Sandstone, composed mainly of quartz (SiO₂) with feldspar and minor iron-oxide cement

AI-generated identification · may be incorrect

Hardness about 6–7 for quartz grains; pale gray-beige, gritty, dull to weakly sparkly, and granular with no obvious cleavage. The uneven weathered surface suggests moderately cemented sandstone.

Identified August 17, 2026More sedimentary →

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Physical properties

Hardness about 6–7 for quartz grains; pale gray-beige, gritty, dull to weakly sparkly, and granular with no obvious cleavage. The uneven weathered surface suggests moderately cemented sandstone.

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a river, coastal, or desert environment; its precise geological age cannot be determined from the image. Iron staining and weathering account for the tan and reddish areas.

Uses & applications

Used as building stone, paving, aggregate, and landscaping material; attractive uniform pieces may be cut for architectural stone. This specimen has little commercial or collector value.

Geological facts

Sandstone commonly preserves ripple marks, cross-bedding, fossils, and ancient environmental clues. A quartz-rich variety resists weathering and often forms ridges or cliffs.

Field identification & locations

Look for visible sand grains, gritty texture, and layering; a glassy scratch test can help confirm quartz, though it may damage the specimen. Common worldwide, especially in sedimentary basins; likely value is $1–$10 as an ordinary hand specimen.