sedimentary

Weathered iron-rich sandstone or ferruginous quartzite

Ferruginous sandstone, likely quartz-rich (SiO₂ with iron oxides/hydroxides)

AI-generated identification · may be incorrect

Brown-orange, earthy surface with dull to slightly granular luster; likely composed mainly of quartz grains cemented by hematite/goethite. Approximate hardness 6–7 if quartz-rich, with no obvious cleavage; iron staining produces the dark mottling.

Identified August 13, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich sandstone or ferruginous quartzite
Scientific name: Ferruginous sandstone, likely quartz-rich (SiO₂ with iron oxides/hydroxides)
Category: sedimentary
Identified: August 13, 2026
Method: Standard

AI Estimated Value

Usually $0–$20 as an ordinary fragment; roughly $20–$100 if unusually patterned, locality-labeled, or sold as landscape décor.

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

Probably a sedimentary sandstone formed from compacted quartz sand and later cemented or stained by iron-bearing fluids; extensive weathering created the rough rind. Exact age and provenance cannot be determined from the photograph.

Uses & applications

Common sandstone is used for landscaping, paving, building stone, and aggregate; attractive pieces may be collected as natural specimens. This weathered fragment has little commercial or jewelry value.

Geological facts

Ferruginous sandstone can resemble ironstone, but a quartz-rich specimen typically scratches glass and shows a gritty texture. Dark patches may be manganese or concentrated iron oxides rather than a separate mineral.

Field identification & locations

Look for visible sand grains, rusty red-brown coloration, and a pale gray fresh interior; a streak test, hardness test, and acid test help distinguish it from limestone or slag. Common in terrestrial sedimentary basins worldwide.