sedimentary

Weathered iron-rich sandstone or laterite

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

AI-generated identification · may be incorrect

Brown to rusty-red, dull to earthy luster, visibly granular and porous, with no obvious crystals or cleavage. Typically Mohs hardness 6–7 for quartz grains but friable overall; specific gravity commonly about 2.3–2.7.

Identified August 12, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich sandstone or laterite
Scientific name: Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite and goethite
Category: sedimentary
Identified: August 12, 2026
Method: Standard

AI Estimated Value

About $1–$15 as an ordinary specimen; $20–$75 if unusually patterned, locality-documented, or polished.

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 from sand-sized quartz grains lithified and later impregnated by oxidized iron during weathering; alternatively it may be a lateritic ironstone. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used locally as building stone, road aggregate, and iron-rich raw material; attractive pieces may be collected as natural specimens. It has little jewelry value unless polished and unusually patterned.

Geological facts

The rusty coloration reflects iron oxidation, similar to the process that produces rust on steel. A dark streak or strongly magnetic response would suggest abundant magnetite or hematite, while fizzing in dilute acid would indicate carbonate cement.

Field identification & locations

Identify by its gritty texture, uneven weathered surface, and reddish-brown iron staining; test with a steel nail, streak plate, magnet, and dilute hydrochloric acid. Common in arid, tropical, and strongly weathered sedimentary terrains.