sedimentary

Weathered brown rock, likely iron-rich sandstone or laterite

Indeterminate; probable ferruginous sandstone/ironstone, composed mainly of quartz with iron-oxide cement

AI-generated identification · may be incorrect

Hardness approximately 5–7 Mohs; brown to ochre, dull earthy luster, fine-grained and massive, with no obvious cleavage. The porous, weathered surfaces and rusty coloration suggest abundant hematite/goethite or limonite.

Identified September 20, 2026More sedimentary →

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At a glance

Common name: Weathered brown rock, likely iron-rich sandstone or laterite
Scientific name: Indeterminate; probable ferruginous sandstone/ironstone, composed mainly of quartz with iron-oxide cement
Category: sedimentary
Identified: September 20, 2026
Method: Standard

AI Estimated Value

Usually under $5 for an ordinary loose fragment; $10–$30 if unusually attractive, fossil-bearing, or clearly mineral-rich.

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 deposited sand or intensely weathered soil later cemented by iron oxides; age cannot be determined from the image. Such material commonly develops in tropical to subtropical, oxidizing environments.

Uses & applications

Used locally as building aggregate, road material, or decorative stone; iron-rich varieties may be collected as mineral specimens, though this example appears ordinary.

Geological facts

Iron oxides produce the characteristic brown-red color and can form a dark streak or reddish powder. A magnet may show weak attraction if magnetite is present.

Field identification & locations

Common in weathered terrains and sedimentary basins worldwide, including Australia, India, Africa, Brazil, and the southern United States. A fresh broken surface, streak test, acid test, grain texture, and density would help distinguish sandstone from laterite or ironstone.