sedimentary

Iron-rich laterite or weathered ironstone

Goethite–hematite-bearing limonite (FeO(OH)·nH₂O / Fe₂O₃), likely lateritic ironstone

AI-generated identification · may be incorrect

Rust-red to dark brown, earthy to dull luster, massive and porous, with no visible crystal faces or cleavage; hardness roughly 4–6, variable, and relatively heavy. The orange-red color indicates iron oxides/hydroxides coating or cementing the rock.

Identified September 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms through intense chemical weathering and oxidation of iron-bearing rock, commonly in tropical or subtropical soils; it may represent a laterite or weathered iron-ore fragment. Exact age cannot be determined from the photograph.

Uses & applications

Used as low- to moderate-grade iron ore, pigment, aggregate, and occasionally as a teaching or lapidary specimen; generally not gem quality.

Geological facts

Hematite produces red streak, while goethite and limonite commonly produce yellow-brown streaks; a magnet may show weak attraction if magnetite is present. Surface texture and color alone cannot distinguish the minerals reliably.

Field identification & locations

Common in tropical lateritic terrains, weathered iron formations, and mine dumps. Test streak on unglazed porcelain, specific gravity, magnetism, and a fresh broken surface; avoid relying solely on color.