what are the four main varieties of iron ore
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The iron itself is usually found in the form of
magnetite (Fe3O4),
hematite (Fe2O3),
goethite,
limonite or
siderite.
Hematite is also known as "natural ore".
The name refers to the early years of mining, when certain hematite ores contained 66% iron and could be fed directly into blast furnaces.
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hamatine , magnetite ,titanomagnetite ,iron ore deposit s.
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