mineral
Likely hematite-rich ironstone fragment
Hematite (α-Fe₂O₃), possibly with other iron oxides
AI-generated identification · may be incorrectSmall, dark gray metallic-to-submetallic fragment with irregular surfaces; hematite has Mohs hardness 5–6 and a reddish-brown streak. Crystal structure: trigonal; cleavage absent or indistinct. The photo is insufficient to confirm composition.
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Physical properties
Small, dark gray metallic-to-submetallic fragment with irregular surfaces; hematite has Mohs hardness 5–6 and a reddish-brown streak. Crystal structure: trigonal; cleavage absent or indistinct. The photo is insufficient to confirm composition.
Formation & geological history
Iron oxides form through chemical precipitation, weathering, or hydrothermal processes, across many geological ages and settings; the specimen’s specific origin cannot be determined from the image.
Uses & applications
Iron ores are major sources of iron for steelmaking; attractive hematite specimens are also collected and sometimes used in jewelry.
Geological facts
A reddish-brown streak on unglazed porcelain is a useful hematite clue, even when the specimen itself looks black or gray.
Field identification & locations
The metallic appearance suggests an iron-rich mineral, but identification needs a streak test and closer examination; hematite occurs worldwide in banded iron formations and oxidized rocks.
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