sedimentary

Weathered sandstone or quartz-rich sedimentary rock

Indeterminate sandstone; commonly quartz–feldspar framework grains cemented by silica, calcite, or iron oxides

AI-generated identification · may be incorrect

Tan-gray, dull to faintly gritty surface with possible fine bedding or weathering bands; likely hardness 6–7 for quartz-rich grains, variable porosity, and no obvious cleavage. The rounded shape appears naturally weathered or transported.

Identified August 27, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or quartz-rich sedimentary rock
Scientific name: Indeterminate sandstone; commonly quartz–feldspar framework grains cemented by silica, calcite, or iron oxides
Category: sedimentary
Identified: August 27, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an ordinary collected specimen; potentially $20–$100 if it displays notable fossils, bedding, color, or verified provenance.

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 from compacted and cemented sand-sized sediment, probably deposited in a river, shoreline, dune, or floodplain environment; age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally sculpture material; this piece has little commercial value without unusual texture, fossils, or provenance.

Geological facts

The image does not show diagnostic fossils or clear sedimentary structures, so exact identification requires a fresh surface, grain inspection, and acid testing for carbonate cement.

Field identification & locations

Look for visible sand grains, layered bedding, and a gritty fracture; quartz-rich sandstone scratches glass, while carbonate-cemented varieties may fizz with dilute hydrochloric acid. Sandstone occurs worldwide, especially in sedimentary basins.