Rock Identifier
Likely weathered iron-rich rock or slag fragment (Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)) — mineral
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.

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Physical properties

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.

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.