sedimentary

Iron-rich sandstone or weathered ironstone

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

AI-generated identification · may be incorrect

Hardness about 5.5–7, reddish-brown to dark gray, earthy to dull luster, and granular or massive texture; visible layering and weathered surfaces are consistent with sandstone or ironstone. Exact identification would benefit from a fresh break, streak, magnetism, and acid testing.

Identified September 9, 2026More sedimentary →

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At a glance

Common name: Iron-rich sandstone or weathered ironstone
Scientific name: Ferruginous sandstone; primarily quartz (SiO₂) cemented or stained by iron oxides, chiefly hematite (Fe₂O₃) and goethite (FeO(OH))
Category: sedimentary
Identified: September 9, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common hand specimen; $30–$100 if unusually shaped, polished, or locality-documented.

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 quartz-rich sand was lithified and later impregnated or cemented by oxidized iron-bearing fluids; commonly Cenozoic to Precambrian depending on locality. Its irregular shape and surface suggest natural weathering or possible human shaping.

Uses & applications

Used locally as building or paving stone and as an iron-bearing ore when sufficiently rich; attractive pieces may be collected as geological specimens. It is generally unsuitable for jewelry unless polished.

Geological facts

The red color typically reflects hematite, while darker zones may contain magnetite or manganese oxides. A reddish-brown streak and weak-to-strong magnetism can help distinguish ironstone from ordinary sandstone.

Field identification & locations

Common in arid and tropical weathering environments, including Australia, India, Brazil, Africa, and parts of North America. Look for gritty grains, layered bedding, an earthy red-brown streak, and possible attraction to a magnet.