mineral
Polished hematite (specimen identification uncertain)
Hematite, α-Fe₂O₃
AI-generated identification · may be incorrectDark steel-gray to black, highly reflective metallic luster; Mohs hardness 5–6.5, trigonal crystal structure, no prominent cleavage; the polished surface and photo do not confirm the material—hematite typically gives a reddish-brown streak.
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Physical properties
Dark steel-gray to black, highly reflective metallic luster; Mohs hardness 5–6.5, trigonal crystal structure, no prominent cleavage; the polished surface and photo do not confirm the material—hematite typically gives a reddish-brown streak.
Formation & geological history
Hematite forms through oxidation and precipitation in iron-rich environments, including banded iron formations and hydrothermal deposits, across many geological ages.
Uses & applications
Used as iron ore and pigment; polished hematite is also made into carvings, beads, and ornamental pieces.
Geological facts
Despite its steel-gray appearance, hematite’s diagnostic streak is red to reddish brown.
Field identification & locations
The oval, mirrorlike finish suggests a polished ornamental specimen, but visual identification alone is unreliable; test streak and magnetism or consult a mineral specialist. Hematite occurs worldwide, notably in Brazil, Australia, China, and the Lake Superior region.
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