sedimentary

Iron-rich sandstone or weathered ironstone fragment

Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite/goethite

AI-generated identification · may be incorrect

Typically tan to rusty brown, earthy to dull luster, fine- to medium-grained, and irregularly fractured; hardness about 6–7 for quartz-rich material, with variable specific gravity and no cleavage.

Identified August 14, 2026More sedimentary →

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At a glance

Common name: Iron-rich sandstone or weathered ironstone fragment
Scientific name: Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite/goethite
Category: sedimentary
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common fragment; $10–$30 for an unusually aesthetic or locality-labeled specimen.

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

Typically tan to rusty brown, earthy to dull luster, fine- to medium-grained, and irregularly fractured; hardness about 6–7 for quartz-rich material, with variable specific gravity and no cleavage.

Formation & geological history

Formed when sand was deposited, compacted, and cemented, with later oxidation producing the brown-orange iron staining; commonly Paleozoic to Mesozoic, though age cannot be determined from the image.

Uses & applications

Used locally as building or paving stone and occasionally collected as an attractive natural specimen; generally has little gem value.

Geological facts

The rusty coloration reflects oxidized iron rather than metallic iron. A streak test may produce a pale reddish-brown mark if hematite-rich, while goethite-rich pieces can be yellow-brown.

Field identification & locations

Common in sedimentary outcrops, stream gravels, and weathered construction stone worldwide; look for visible sand grains, layering, and a reddish-brown streak. The underlying slab appears to be a separate stone surface, possibly polished stone.