sedimentary

Weathered sandstone or siltstone

Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by clay, silica, or iron oxides

AI-generated identification · may be incorrect

Tan-brown, dull to earthy luster, fine-grained and weakly layered with irregular fracture and crumbly weathering; typical hardness is about 2–6 Mohs depending on cement, with no obvious cleavage. The rough surface and thin lamination suggest siltstone or very fine sandstone rather than a mineral crystal.

Identified August 12, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or siltstone
Scientific name: Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by clay, silica, or iron oxides
Category: sedimentary
Identified: August 12, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common hand specimen; higher only if provenance, fossils, or distinctive sedimentary structures are confirmed.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Formed when wind- or water-deposited sand and silt compacted and cemented into rock, potentially ranging from Precambrian to recent geological ages depending on locality. Its softened edges and surface crust reflect prolonged chemical and mechanical weathering.

Uses & applications

Commonly used as building stone, paving, wall material, and aggregate when sufficiently durable; attractive varieties may be used decoratively. This ordinary specimen has little commercial or collector value.

Geological facts

Fine sandstone and siltstone can preserve ripple marks, mud cracks, bedding, or fossils, though none are clearly diagnostic in this image. Iron-oxide staining commonly produces the tan, ochre, and brown coloration.

Field identification & locations

Look for gritty grains (sandstone), a smooth floury texture (siltstone), visible bedding, and a streak that does not strongly powder like clay; dilute acid usually causes little or no reaction unless carbonate cement is present. Common worldwide in sedimentary basins and exposed road cuts.