mineral

Red-brown iron-rich mineral specimen, likely hematite/goethite

Hematite (Fe₂O₃), possibly mixed with goethite (FeO(OH)) and iron oxides

AI-generated identification · may be incorrect

Hardness about 5–6.5 Mohs; earthy to submetallic luster, reddish-brown to dark brown color, irregular porous texture, and no obvious cleavage. Hematite typically leaves a red-to-reddish-brown streak; goethite commonly produces a yellow-brown streak.

Identified September 21, 2026More mineral →

Explore Red-brown iron-rich mineral specimen, likely hematite/goethite in the encyclopedia →

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Physical properties

Formation & geological history

Forms through oxidation and weathering of iron-bearing rocks, hydrothermal processes, or sedimentary iron deposits; specimens may range from Precambrian ore minerals to young weathering crusts. The image alone cannot establish geological age.

Uses & applications

Used as iron ore and pigment; attractive botryoidal or crystalline specimens are collected, and polished varieties may be used ornamentally. This rough piece has little jewelry value unless confirmed to be a notable locality specimen.

Geological facts

The red streak is more diagnostic than surface color, which can be dark brown or nearly black. Iron oxides commonly coat or replace other minerals, producing porous, cavernous pieces like this.

Field identification & locations

Common in oxidized ore zones, soils, desert varnish, and banded iron formations worldwide; test the streak on unglazed porcelain and check for magnetism. Exact identification requires streak, density, hardness, and ideally analysis.