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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 ...
Iron (III) oxide in a vial. Iron (III) oxide or ferric oxide is the inorganic compound with the formula Fe 2 O 3. It is one of the three main oxides of iron, the other two being iron (II) oxide (FeO), which is rare; and iron (II,III) oxide (Fe 3 O 4), which also occurs naturally as the mineral magnetite.
Iron ochre or hematite [2]: 85 — Fe 2 O 3, [3]: 212 a widespread iron mineral, one of the most important iron ores; Iron ochre or limonite [ 2 ] : 85 — Fe 2 O 3 ·Н 2 О, [ 4 ] : 30 a mixture of secondary natural minerals, iron oxide hydrates;
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.
Streak plates with pyrite (left) and rhodochrosite (right). The streak of a mineral is the color of the powder produced when it is dragged across an un-weathered surface. Unlike the apparent color of a mineral, which for most minerals can vary considerably, the trail of finely ground powder generally has a more consistent characteristic color, and is thus an important diagnostic tool in ...
Iron ore. Hematite, the main iron ore found in Brazilian mines. Stockpiles of iron ore pellets like this one are used in steel production. An illustration of iron ore being unloaded at docks in Toledo, Ohio. Iron ores[1] are rocks and minerals from which metallic iron can be economically extracted.
Maghemite (Fe 2 O 3, γ-Fe 2 O 3) is a member of the family of iron oxides. It has the same formula as hematite, but the same spinel ferrite structure as magnetite (Fe3O4) and is also ferrimagnetic. It is sometimes spelled as "maghaemite". Maghemite can be considered as an Fe (II)-deficient magnetite with formula [6] where represents a vacancy ...
Itabirite, also called banded-quartz hematite or hematite schist, is a foliated, metamorphosed oxide-facies iron formation in which the original chert or jasper bands have been recrystallized into macroscopically distinguishable grains of quartz and the iron is present as thin layers of hematite, magnetite, or martite (pseudomorphs of hematite after magnetite).
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