mineral
Hematite (or Magnetite iron ore gravel)
Hematite (Fe2O3) / Magnetite (Fe3O4)
AI-generated identification · may be incorrectMohs hardness 5.5-6.5, metallic to sub-metallic luster, dark steel-gray to blackish-brown color, reddish-brown (hematite) or black (magnetite) streak, high specific gravity (~5.1-5.3).
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Physical properties
Mohs hardness 5.5-6.5, metallic to sub-metallic luster, dark steel-gray to blackish-brown color, reddish-brown (hematite) or black (magnetite) streak, high specific gravity (~5.1-5.3).
Formation & geological history
Formed through sedimentary precipitation in banded iron formations (BIFs), hydrothermal processes, or weathered residual placer deposits.
Uses & applications
Primary ore of iron and steel manufacturing, heavy media separation, radiation shielding, and pigment production.
Geological facts
Hematite gives Mars its characteristic reddish color and has been used by humans as a red ochre pigment for over 100,000 years.
Field identification & locations
Identify in the field by high density, sub-metallic shine, and testing for magnetism and a red-brown streak on unglazed porcelain.
