sedimentary

Iron-rich breccia or ironstone

Hematite/goethite-bearing breccia; likely Fe₂O₃–FeO(OH) with silica and iron-stained rock fragments

AI-generated identification · may be incorrect

Hardness roughly 5–6.5 Mohs; rusty red-brown to dark brown, earthy to dull/submetallic luster, irregular angular texture, and no obvious cleavage. The yellow-orange coating likely consists of goethite/limonite, while darker red-brown clasts may be hematite-rich material.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when iron-bearing minerals precipitated or weathered around cemented rock fragments, commonly in oxidizing near-surface environments; exact age and locality cannot be determined from the photograph. It may also represent a weathered iron-formation fragment or ironstone pebble.

Uses & applications

Used as iron ore when sufficiently rich, and occasionally as pigment or a lapidary/collector specimen; this rough piece has little commercial value.

Geological facts

Iron oxides produce the characteristic red, orange, and brown colors. A reddish-brown streak on unglazed ceramic and attraction to a strong magnet can help distinguish iron-rich material, though hematite is usually weakly magnetic.

Field identification & locations

Common in lateritic soils, desert gravels, banded iron formations, and weathered ore zones worldwide; test streak, magnetism, density, and fresh broken surfaces for confirmation.