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 Industry News => What is Hematite??? ¡¾Print this page¡¿ ¡¾Back¡¿
Release time£º[2006-5-28]    Readed[9318]Times

Hematite




Tujetsch (Tavetsch), Grischun (Grisons; Graub¨¹nden), Switzerland
© 2003 John H. Betts
Formula:
Fe
2
O
3
System: Trigonal Colour: Steel-grey to black in ...
Lustre: Sub-Metallic,Dull,Earthy Hardness: 5 - 6
Name: From the Greek, haimatites, "bloodlike'" in allusion to vivid red color of the powder.
Hematite is rather variable in its appearence - it can be in reddish brown, ocherous, masses, dark silvery-grey scaled masses, silvery-grey crystals, and dark-grey masses, to name a few. What they all have in common is a rust-red streak.
Classification of Hematite
IMA status: Approved
Validity of Species: A valid mineral species
Strunz ID: 4/C.04-20

4 : Oxides & Hydroxides
C : Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)
04 : Hematite group
Dana ID: 4.3.1.2
Hey's CIM Ref.: 7.20.4
mindat.org URL: http://www.mindat.org/min-1856.html
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Occurrences of Hematite
Geological Setting: Large ore bodies of hematite are usually of sedimentary origin; also found in high-grade ore bodies in metamorphic rocks due to contact metasomatism, and occasionally as a sublimate on igneous extrusive rocks ("lavas") as a result ov volcanic activity. It is also found coloring soils red all over the planet...
Industrial Uses: A major ore of iron.
Physical Properties of Hematite
Lustre: Sub-Metallic,Dull,Earthy
Diapheny: Translucent on thin edges,Opaque
Colour: Steel-grey to black in crystals and massively crystalline ores, dull to bright "rust-red" in in earthy, compact, fine-grained material.
Streak: Reddish brown ("rust-red")
Hardness (Mohs') 5 - 6
Hardness Data: Measured
Tenacity: Brittle
Fracture: Irregular/Uneven
Density (measured): 5.26 g/cm3
Density (calculated): 5.27 g/cm3
Crystallography of Hematite
Crystal System: Trigonal
Cell Parameters: a = 5.036, c = 13.749
Ratio: a:c = 1 : 2.73
Z: 6
Morphology: Crystals generally thick to thin tabular {0001}, rarely prismatic [0001] or scalenohedral; also rarely rhombohedral {10-11}, producing pseudo-cubic crystals. Often found in sub-parallel growths on {0001} or as rosettes ("iron crosses.") Sometimes in micaceous to platy masses. May be compact columnar or fibrous masses, sometimes radiating, or in reniform masses with a smooth fracture ("kidney ore"), and botryoidal and stalactic. Frequently in earth masses, also granular, friable to compact, concretionary and oolitic.
Twinning: Penetration twins on {0001}, or with {10-10} as a composition plane.
X-Ray Powder Diffraction Data for Hematite
X-Ray Data: 3.68(30)
2.70(100)
2.52(70)
2.21(20)
1.84(40)
1.69(50)
1.49(30)
1.45(30)
Relationship of Hematite to other Species
Associates:
  • Quartz
  • Rutile
  • Calcite
  • Pyrite
  • Smoky Quartz
  • Fluorite
  • Chlorite Group
  • Cuprite
  • Rock Crystal
  • Copper
  • Related Minerals (Strunz Grouping):
    4/C.04-10 Corundum
    Al
    2
    O
    3
    4/C.04-30 Eskolaite
    Cr
    2
    O
    3
    4/C.04-40 Karelianite
    V
    2
    O
    3
    Related Minerals (Hey's Index Grouping):
    7.20.1 W¨¹stite
    FeO
    7.20.2 Magnetite
    Fe
    2+
    Fe
    3+
    2
    O
    4
    7.20.3 Maghemite
    Fe
    2
    O
    3
    7.20.5 Goethite
    ¦Á-Fe
    3+
    O(OH)
    7.20.6 Akagan¨¦ite
    ¦Â-Fe
    3+
    O(OH,Cl)
    7.20.7 Feroxyhyte
    Fe
    3+
    O(OH)
    7.20.8 Lepidocrocite
    ¦Ã-Fe
    3+
    O(OH)
    7.20.9 Ferrihydrite
    Fe
    5
    O
    3
    (OH)
    9
    7.20.10 Amakinite
    (Fe,Mg)(OH)
    2
    7.20.11 Magnesioferrite
    MgFe
    3+
    2
    O
    4
    7.20.12 Muskoxite
    Mg
    7
    Fe
    4
    O
    13
    ¡¤10H
    2
    O
    7.20.13 Srebrodolskite
    Ca
    2
    Fe
    2
    O
    5
    7.20.14 Hercynite
    FeAl
    2
    O
    4
    7.20.15 Brownmillerite
    Ca
    2
    AlFeO
    5
    Related Minerals (Dana Grouping):
    4.3.1.1 Corundum
    Al
    2
    O
    3
    Chemical Properties of Hematite
    Formula:
    Fe
    2
    O
    3
    Elements: Fe, O
    Common Impurities: Ti,Al,Mn,H2O
    Other Names for Hematite
    Synonyms:
  • Alaska Black Diamond
  • Anhydroferrit
  • Anhydroferrita
  • Anhydroferrite
  • Blodsten
  • Blutstein
  • Eisenglanz
  • Ematite
  • Fer oligiste
  • Haematit
  • Haematita
  • Haematite
  • Hematit
  • Hematita
  • Hematite, Red
  • Jernglans
  • Red Hematite
  • Red Iron Ore
  • Red Ochre
  • Roteisenstein
  • Ruddle
  • Sanguine
  • Fer oxyd¨¦ (in part)
  • Iron Ochre (in part)
  • Varieties:
  • Alumohematite
  • Crucilite
  • Iron Rose
  • Kidney Ore
  • Martite
  • Specularite
  • Other Information
    Health Warning: There is no specific data on health dangers or toxicity for this mineral, however you should always treat mineral samples as potentially toxic/dangerous and use sensible precautions when handling them.
    References for Hematite
    American Mineralogist (1966): 51: 123-129.

    Mao, H.K., D. Virgo, & P.M. Bell (1977), High-pressure 57Fe Mössbauer data on the phase and magnetic transitions of magnesioferrite (MgFe2O4), magnetite (Fe3O4), and hematite (Fe2O3). Carnegie Instsitution of Washington Year Book: 76: 522-525.

    Gaines, Richard V., H. Catherine, W. Skinner, Eugene E. Foord, Brian Mason, Abraham Rosenzweig (1997), Dana's New Mineralogy : The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana: 217.

    Andrault, D., & Bolfan-Casanova, N. (2001), High-pressure phase transformation in the MgFe2O4 and Fe2O3-MgSiO3 systems: Physics and Chemistry of Minerals: 28: 211-217.

    Rozenberg, G.Kh., L.S. Dubrovinsky, M.P. Pasternak, O. Naaman, T. LeBihan, & R. Ahuja (2002), High-pressure structural studies of hematite (Fe2O3): Physical Review B: 65: 064112.

    Shim, S-H., & T.S. Duffy (2002), Raman spectroscopy of Fe2O3 to 62GPa: American Mineralogist: 87: 318-326.
    Internet Links for Hematite
    Search Engines:
  • Look for Hematite on Google
  • Look for Hematite images on Google
  • External Links:
  • Look for Hematite on Webmineral
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Hematite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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