sedimentary

Weathered sandstone fragment

Sandstone, primarily quartz (SiO₂) with feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Tan-pink, granular, and dull to slightly earthy luster; likely hardness about 6–7 for quartz grains, but weakly cemented overall. Clastic grains and subtle bedding are visible; cleavage is absent, and density is commonly 2.2–2.7 g/cm³.

Identified August 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a river, shoreline, dune, or desert setting; the specimen is likely geologically millions to hundreds of millions of years old, though age cannot be determined from the image.

Uses & applications

Used as building stone, paving, aggregate, and ornamental material; attractive varieties are cut for decorative surfaces and small specimens.

Geological facts

The pink-orange coloration commonly reflects iron-oxide coatings or cement. Sandstone can be distinguished from granite by its uniformly granular texture and lack of interlocking visible crystals.

Field identification & locations

Look for gritty texture, individual sand grains, porous surfaces, and possible layering; a steel knife may scratch weakly cemented material but not quartz grains. Common worldwide, especially in sedimentary basins; value is typically $1–$10 for an ordinary fragment, or $10–$50 for unusual locality or attractive specimens.