sedimentary

Iron-rich sandstone (ferruginous sandstone)

Ferruginous sandstone, composed mainly of quartz (SiO₂) cemented by iron oxides such as hematite or goethite

AI-generated identification · may be incorrect

Brown, rough, granular surface with scattered darker grains; likely Mohs hardness about 6–7, vitreous quartz grains, and no distinct cleavage. Exact composition and properties cannot be confirmed from the photo alone.

Identified September 23, 2026More sedimentary →

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At a glance

Common name: Iron-rich sandstone (ferruginous sandstone)
Scientific name: Ferruginous sandstone, composed mainly of quartz (SiO₂) cemented by iron oxides such as hematite or goethite
Category: sedimentary
Identified: September 23, 2026
Method: Standard

AI Estimated Value

About $1–$20 for a small, ordinary hand specimen; higher prices generally require unusual patterns, provenance, or display quality.

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

Forms when sand grains are deposited, buried, and cemented by iron-rich minerals; its age depends on the source formation and cannot be determined visually.

Uses & applications

Commonly used as building or landscaping stone where durable; iron-rich varieties may be collected for their color and texture.

Geological facts

Iron-oxide cement gives ferruginous sandstone its rusty brown to red coloration and can make it noticeably heavier or harder than weakly cemented sandstone.

Field identification & locations

Look for visible sand-sized grains and rusty iron staining; it should feel gritty rather than crystalline. Ferruginous sandstone occurs in sedimentary basins worldwide.