sedimentary

Ironstone concretion with iron-oxide/possibly hematite inclusions

Ferruginous sandstone or lateritic ironstone; inclusions likely hematite (Fe₂O₃) and/or goethite (FeO(OH))

AI-generated identification · may be incorrect

Reddish-brown, earthy, dull to submetallic surface with darker rusty inclusions; typical hardness ~5–6.5 for hematite-bearing material, variable porosity, and no obvious cleavage. The rounded shape suggests a naturally weathered concretion or pebble.

Identified September 12, 2026More sedimentary →

Explore Ironstone concretion with iron-oxide/possibly hematite inclusions 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: Ironstone concretion with iron-oxide/possibly hematite inclusions
Scientific name: Ferruginous sandstone or lateritic ironstone; inclusions likely hematite (Fe₂O₃) and/or goethite (FeO(OH))
Category: sedimentary
Identified: September 12, 2026
Method: Standard

AI Estimated Value

About $1–$10 as a common specimen; potentially $10–$30 if the inclusions prove unusual or locality-specific.

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

Formed when iron oxides cemented sand, clay, or soil during weathering and groundwater movement; commonly Cenozoic to older, depending on its host deposit. Exact age cannot be determined from the photograph.

Uses & applications

Primarily a geological or educational specimen; iron-rich rocks have historically been mined as low-grade iron ore and used as pigments, aggregate, or building stone. This example is unlikely to have jewelry value.

Geological facts

Hematite produces red-brown streak and commonly gives ironstone its coloration; magnetism, if present, may indicate magnetite or maghemite rather than pure hematite.

Field identification & locations

Look for a red-to-reddish-brown streak on unglazed ceramic, heavy feel, and rusty weathering; a strong magnet suggests magnetite-bearing ironstone. Common in lateritic soils, stream gravels, banded iron formations, and sedimentary iron deposits worldwide.