mineral

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

AI-generated identification · may be incorrect

Brown to reddish-brown, earthy to submetallic luster, irregular texture, and no visible crystal faces; likely Mohs hardness about 4–6, though slag may be glassier and harder. The image is too blurred for reliable identification, and the blue fabric may distort colors.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

If natural, iron oxides formed by oxidation and weathering of iron-bearing minerals, commonly in soil and ore deposits; if slag, it is a human-made smelting byproduct rather than a geological rock. Geological age cannot be determined from the image.

Uses & applications

Iron-oxide specimens are collected and historically used as pigments and iron ore; iron slag has limited collector value and may be used as aggregate. It is not suitable for jewelry without clearer confirmation.

Geological facts

Reddish-brown coloration commonly comes from hematite and goethite; a streak test is more diagnostic than surface color. Strong magnetism would suggest magnetite-bearing material or industrial slag.

Field identification & locations

Test streak on unglazed porcelain: hematite gives red-brown streak, goethite yellow-brown, while slag may leave little streak and show vesicles or glassy surfaces. Estimated value: $1–$10 for common fragments; distinctive ore specimens may reach $10–$30.