mineral

Likely iron-rich hematite or goethite

Hematite (Fe₂O₃) or goethite (FeO(OH)); the photo alone cannot distinguish them confidently.

AI-generated identification · may be incorrect

Dark brown-black, irregular lump with a shiny to submetallic surface; hardness about 5–6.5 for hematite or 5–5.5 for goethite. Crystal structure and streak are not visible; hematite typically leaves a reddish-brown streak, while goethite gives a yellow-brown streak.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Iron oxides form through chemical weathering, oxidation, and precipitation in soils, veins, and sedimentary iron deposits. The specimen’s age and exact formation setting cannot be determined from the image.

Uses & applications

Iron ores are major sources of iron for steel; attractive pieces are also collected, and hematite is sometimes used as a pigment or ornamental material.

Geological facts

A streak test on unglazed porcelain is more diagnostic than the dark exterior color. The reported Baja California-area location makes iron oxides geologically plausible, but does not establish provenance.

Field identification & locations

Check streak and heft: hematite is notably dense (specific gravity around 5.3), while goethite is generally around 3.3–4.3. Iron oxides occur worldwide, including in weathered and mineralized terrains; avoid destructive testing on a valued specimen.