mineral
Hematite (iron oxide)
Hematite, α-Fe₂O₃
AI-generated identification · may be incorrectThe small reddish-brown specimen appears earthy to submetallic, but its crystal form and streak cannot be confirmed from the image. Hematite has Mohs hardness 5–6.5, a trigonal crystal structure, and no distinct cleavage; its diagnostic streak is red-brown.
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Physical properties
The small reddish-brown specimen appears earthy to submetallic, but its crystal form and streak cannot be confirmed from the image. Hematite has Mohs hardness 5–6.5, a trigonal crystal structure, and no distinct cleavage; its diagnostic streak is red-brown.
Formation & geological history
Forms through oxidation of iron-rich minerals and in sedimentary iron formations, hydrothermal veins, and metamorphic rocks. Hematite occurs from ancient Precambrian deposits to modern weathering environments.
Uses & applications
A major iron ore used to produce steel; fine, lustrous specimens are also collected, and powdered hematite has been used as pigment.
Geological facts
Hematite can look metallic gray or red and earthy, yet characteristically leaves a reddish-brown streak.
Field identification & locations
The rusty color is consistent with hematite, but identification is uncertain from this view; test the streak on unglazed porcelain and compare hardness. It is widespread, especially in iron-rich formations and weathered rocks.
