mineral

Likely hematite-rich iron ore

Hematite (Fe₂O₃), possibly with magnetite and/or goethite

AI-generated identification · may be incorrect

Dark gray to black, metallic-to-submetallic luster, irregular botryoidal or granular surface; hematite has Mohs hardness about 5–6.5 and specific gravity ~5.3, but the specimen’s exact properties require testing.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms by oxidation and chemical precipitation in iron-rich environments, including banded iron formations and hydrothermal or weathering zones; deposits range from Precambrian to young secondary ores.

Uses & applications

Used as an iron ore and pigment; attractive polished or crystalline pieces are collected, though this rough specimen likely has modest value.

Geological facts

A reddish-brown streak on unglazed porcelain strongly supports hematite; magnetite instead gives a black streak and is strongly magnetic.

Field identification & locations

Common in iron-rich regions worldwide, including Brazil, Australia, India, South Africa, and the Lake Superior region. Test streak, magnetism, and density; the image alone cannot distinguish hematite confidently from magnetite or slag.