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Which of the following Iron ores is mined at Bailadila?
1. Hematite
2. Siderite
3. Limonite
4. Magnetite
5. None of the above/More than one of the above

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Correct Answer - Option 1 : Hematite

The correct answer is Hematite.

  • Hematite:
    • Hematite is one of the most abundant minerals on Earth's surface and in the shallow crust.
    • It is an iron oxide with a chemical composition of Fe2O3.
    • It is a common rock-forming mineral found in sedimentary, metamorphic, and igneous rocks at locations throughout the world.
    • Hematite is the most important ore of iron.
    • The most important deposits of hematite are sedimentary in origin.
    • The world’s largest production (nearly 75 million tons of hematite annually) comes from a sedimentary deposit in the Lake Superior district in North America.
    • Other important deposits include those at Minas Gerais, Brazil (where the hematite occurs in metamorphosed sediments); Cerro Bolívar, Venezuela; and Labrador and Quebec, Canada.
    • Hematite is found as an accessory mineral in many igneous rocks; commonly as a weathering product of siderite, magnetite, and other iron minerals; and almost universally as a pigmenting agent of sedimentary and other rocks.
  • Major Iron Mines in India:
    • Bailadila Iron Ore - Chhattisgarh
    • Dalli Rajhara - Chhattisgarh
    • Vyasanakere Mines - Karnataka
    • Mayurbhanj - Odisha
    • Ratnagiri - Maharashtra
    • Gua - Jharkhand

  • Iron ores and their Formulas:
Iron ores Formulas
Hematite Fe2O3
Siderite FeCO3
Limonite FeO(OH)·nH2O
Magnetite Fe3O4
  • Siderite:
    • Siderite, also called chalybite, iron carbonate (FeCO3), a widespread mineral that is an ore of iron.
    • The mineral commonly occurs in thin beds with shales, clay, or coal seams (as sedimentary deposits) and in hydrothermal metallic veins (as gangue, or waste rock).
    • Manganese (Mn), magnesium (Mg), and calcium generally substitute in part for iron; siderite forms a complete solid-solution (chemical replacement) series with magnesite (MgCO3), another with rhodochrosite (MnCO3), and an incomplete one with ferroan calcite.
  • Limonite:
    • Limonite, one of the major iron minerals, hydrated ferric oxide (FeO(OH)·nH2O).
    • It was originally considered one of a series of such oxides.
    • The name limonite properly should be restricted to impure hydrated iron oxide (with variable water content) that is colloidal, or amorphous, in character.
    • Often brown and earthy, it is formed by alteration of other iron minerals.
    • It probably bears the same relationship to iron oxides that wad and gummite due to manganese and uranium oxides.
  • Magnetite:
    • Magnetite, also called lodestone, or magnetic iron ore, iron oxide mineral (FeFe3O4, or Fe3O4) that is the chief member of one of the series of the spinel group.
    • Minerals in this series form black to brownish, metallic, moderately hard octahedrons and masses in igneous and metamorphic rocks and in granite pegmatites, stony meteorites, and high-temperature sulphide veins.
    • The magnetite series also contains magnesioferrite (magnesium iron oxide, MgFe3O4), franklinite (zinc-iron oxide, ZnFe2O4), jacobsite (manganese iron oxide, MnFe2O4), and trevorite (nickel-iron oxide, NiFe2O4).

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