sedimentary

Weathered iron-rich rock, likely ferruginous sandstone or lateritic concretion

Iron-oxide–cemented sandstone; commonly dominated by quartz (SiO₂), goethite (FeO(OH)) and hematite (Fe₂O₃)

AI-generated identification · may be incorrect

Brown to ochre, dull earthy luster, fine- to medium-grained and apparently massive; hardness roughly 5–7, with iron-oxide coatings and cement. Exact identification requires a fresh surface, streak, magnetism, and acid testing.

Identified August 18, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich rock, likely ferruginous sandstone or lateritic concretion
Scientific name: Iron-oxide–cemented sandstone; commonly dominated by quartz (SiO₂), goethite (FeO(OH)) and hematite (Fe₂O₃)
Category: sedimentary
Identified: August 18, 2026
Method: Standard

AI Estimated Value

$1–$10 for a common field specimen; approximately $10–$30 if unusually attractive, dense, 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

Likely formed when groundwater concentrated and cemented iron oxides through porous sand or weathered soil; age is indeterminate from the photograph and may range from ancient sedimentary strata to recent laterite.

Uses & applications

Commonly used as aggregate, road material, or low-grade iron ore where sufficiently iron-rich; generally little jewelry value, though attractive pieces may be collected as natural specimens.

Geological facts

The orange-brown coloration comes mainly from hydrated iron oxides; darker patches may contain hematite, manganese oxides, or organic staining.

Field identification & locations

Look for visible sand grains, rusty coatings, earthy red-brown streak, and possible weak magnetism; widespread in tropical lateritic terrains and iron-rich sedimentary regions. A fresh broken face would distinguish sandstone from a dense concretion.