sedimentary

Iron-rich sandstone or weathered ironstone

Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

AI-generated identification · may be incorrect

Hardness typically 5.5–7 (Mohs), reddish-brown, dull to earthy luster, granular texture, and no obvious cleavage; the slab-like shape and rusty coloration suggest iron cement or staining. Exact identification cannot be confirmed from a photograph alone.

Identified September 5, 2026More sedimentary →

Explore Iron-rich sandstone or weathered ironstone in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Iron-rich sandstone or weathered ironstone
Scientific name: Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))
Category: sedimentary
Identified: September 5, 2026
Method: Standard

AI Estimated Value

Typically $0–$10 as a common loose specimen; attractive polished or locality-labeled pieces may sell for about $10–$40.

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

Likely formed when quartz-rich sand was deposited, compacted, and cemented by silica and iron oxides, commonly in terrestrial or shallow-marine environments. Its age depends on the locality and may range from Paleozoic to much younger.

Uses & applications

Used locally as building stone, paving aggregate, and occasionally ornamental stone; ordinary pieces have little jewelry value.

Geological facts

The red color reflects oxidized iron, similar to rust. Weathering can produce irregular cavities, dark manganese stains, and a rough, resistant surface.

Field identification & locations

Look for visible sand grains, gritty texture, and red-brown iron staining; a streak test may leave a reddish-brown mark, while dilute hydrochloric acid usually produces little reaction. Common in iron-bearing sedimentary terrains and gravel landscaping.