sedimentary

Likely weathered ironstone or iron-stained sandstone fragment

Ferruginous sandstone/ironstone, chiefly quartz (SiO₂) with iron oxides such as hematite and goethite

AI-generated identification · may be incorrect

Tan-gray, rusty-brown, fine-grained and apparently massive, with dull to earthy luster and no obvious crystals or cleavage. Typical hardness is about 6–7 where quartz-rich, though weathered iron-rich areas may be softer; specific gravity commonly 2.4–3.2.

Identified September 4, 2026More sedimentary →

Explore Likely weathered ironstone or iron-stained sandstone fragment 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: Likely weathered ironstone or iron-stained sandstone fragment
Scientific name: Ferruginous sandstone/ironstone, chiefly quartz (SiO₂) with iron oxides such as hematite and goethite
Category: sedimentary
Identified: September 4, 2026
Method: Standard

AI Estimated Value

Common fragment: approximately $0–$5; attractive polished or fossil-like pieces may reach $10–$30.

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 weathered sedimentary rock or iron-cemented surface fragment, formed when quartz sand was lithified and later stained or cemented by oxidized iron. The image cannot establish its geological age; such rocks are common in transported glacial, river, and construction fill deposits around the Frankfurt region.

Uses & applications

Usually a common field or landscaping stone with little commercial value; iron-rich sandstone may be used locally as building or paving stone. Not normally suitable for jewelry.

Geological facts

The small projecting rusty-brown piece may be iron oxide cement, weathered coating, or a separate iron-rich inclusion rather than a distinct mineral crystal.

Field identification & locations

In the field, look for gritty texture, quartz grains, rusty streaks, and a lack of carbonate reaction. A steel nail should not scratch fresh quartz-rich surfaces; dilute hydrochloric acid would show little or no fizz, unlike limestone. Finding it in brush beside a meadow does not indicate local bedrock, since it may be imported fill or transported stone.