sedimentary

Weathered sandstone or siltstone fragment

Clastic sedimentary rock, likely quartz–feldspar-rich sandstone/siltstone

AI-generated identification · may be incorrect

Fine-grained, dull gray-beige, earthy texture with weak layering or granular fracture; likely Mohs hardness about 5–7, depending on cement, and specific gravity roughly 2.3–2.7. No visible crystals, cleavage, or metallic luster.

Identified August 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand- or silt-sized particles accumulated, compacted, and cemented in an ancient river, lake, floodplain, or marine setting; the specimen’s geological age cannot be determined from the image.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally decorative material; this small weathered fragment has little commercial or jewelry value.

Geological facts

The rounded shape and crumbly weathered surface suggest natural abrasion and oxidation, but a photograph cannot distinguish sandstone confidently from weathered siltstone, mudstone, or compacted soil.

Field identification & locations

Look for visible grains, bedding, and gritty texture; a glass-scratch test can indicate quartz-rich sandstone, while dilute vinegar usually produces no reaction unless carbonate cement is present. Common worldwide in sedimentary basins.