hematite

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Definition/MeaningWord/Phrase
hard grey-black mineral consisting of corundum and either hematite or magnetite; used as an abrasive (especially as a coating on paper) emery
widely occurring iron oxide ore; a mixture of goethite and hematite and lepidocrocite limonite
variety of chert containing magnetite and hematite; mined as a low-grade iron ore taconite
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