sedimentary

Likely ironstone or iron-rich rock fragment

Iron-oxide-rich sedimentary material, chiefly hematite (α-Fe₂O₃) and/or goethite (FeO(OH)); exact identification is not possible from the image

AI-generated identification · may be incorrect

Small, rough, reddish-brown fragment with an earthy to dull luster; ironstone hardness varies (hematite 5–6.5 Mohs; goethite 5–5.5). Crystal structure and cleavage are not discernible in the photo.

Identified October 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Iron oxides commonly form by weathering and oxidation, then accumulate in soils or sedimentary deposits; age and specific formation setting cannot be determined from the image.

Uses & applications

Iron-rich ores are sources of iron, while ordinary fragments are mainly collected as geological curiosities; this piece is too small to assess as ore.

Geological facts

A reddish-brown streak on unglazed porcelain can help identify hematite; goethite typically gives a yellow-brown streak.

Field identification & locations

The color and texture suggest iron-rich material, but a fresh surface, streak, and hardness tests are needed to distinguish ironstone from other red rocks. Iron-rich sediments occur worldwide.