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  2. Hematite - Wikipedia

    en.wikipedia.org/wiki/Hematite

    Hematite (/ ˈ h iː m ə ˌ t aɪ t, ˈ h ɛ m ə-/), also spelled as haematite, is a common iron oxide compound with the formula, Fe 2 O 3 and is widely found in rocks and soils. [6] Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of Fe 2 O 3. It has the same crystal structure as corundum ...

  3. Iron(III) oxide - Wikipedia

    en.wikipedia.org/wiki/Iron(III)_oxide

    Iron(III) oxide in a vial. Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe 2 O 3.It occurs in nature as the mineral hematite, which serves as the primary source of iron for the steel industry.

  4. Iron ore - Wikipedia

    en.wikipedia.org/wiki/Iron_ore

    Due to the high density of hematite relative to associated silicate gangue, hematite beneficiation usually involves a combination of beneficiation techniques. One method relies on passing the finely-crushed ore over a slurry containing magnetite or other agent such as ferrosilicon which increases its density.

  5. Iron (II,III) oxide - Wikipedia

    en.wikipedia.org/wiki/Iron(II,III)_oxide

    Iron(II,III) oxide, or black iron oxide, is the chemical compound with formula Fe 3 O 4.It occurs in nature as the mineral magnetite.It is one of a number of iron oxides, the others being iron(II) oxide (FeO), which is rare, and iron(III) oxide (Fe 2 O 3) which also occurs naturally as the mineral hematite.

  6. Volcanogenic massive sulfide ore deposit - Wikipedia

    en.wikipedia.org/wiki/Volcanogenic_massive...

    The density generally is 4500 kg/m 3. ... The mound zone consists of laminated massive to brecciated pyrite, sphalerite (± galena), hematite, and barite. The mound ...

  7. Martian spherules - Wikipedia

    en.wikipedia.org/wiki/Martian_spherules

    Detail showing hematite spherules eroding out of blocks of sediment ejecta. It is better to click and enlarge this. Notice the increased surface density of loose spherules lying in rings around the small clocks of sediment ejecta. This image is cropped out of a larger image taken on Sol 1162 (2007-05-01).

  8. Magnetite - Wikipedia

    en.wikipedia.org/wiki/Magnetite

    Magnetite has been important in understanding the conditions under which rocks form. Magnetite reacts with oxygen to produce hematite, and the mineral pair forms a buffer that can control how oxidizing its environment is (the oxygen fugacity). This buffer is known as the hematite-magnetite or HM buffer.

  9. Meridiani Planum - Wikipedia

    en.wikipedia.org/wiki/Meridiani_Planum

    A few loose hematite spherules on an outcrop of sediments about 200 m from Endeavour Crater. The largest spherule has a diameter of 8.3 mm - this is one of the biggest photographed anywhere by Opportunity. The lower number density of spherules in this image is mainly due to the spherules sitting on outcrop rock rather than on soil.

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