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16.40: Hematite

  • Page ID
  • Hematite

    Chemical composition Fe2O3
    Crystal system Trigonal
    Habit Tabular to thick crystals; micaceous or platy, commonly in rosettes; radiating fibrous, reniform, botryoidal or stalactitic masses, columnar; earthy, granular, oolitic
    Cleavage None, may show partings on {0001} and {1011}
    Fracture Uneven to sub-conchoidal
    Hardness 5.5–6.5
    Refractive index nω = 3.150–3.220, nε = 2.870–2.940
    Specific gravity 5.26
    Lustre Metallic
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