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A variety of chert containing magnetite and hematite, mined as an iron ore.
[After the Taconic (Mountains).]
(Geological Science) a fine-grained sedimentary rock containing magnetite, haematite, and silica, which occurs in the Lake Superior region: a low-grade iron ore
[C20: named after the Taconic Mountains in New England]
an iron-bearing chert mined as low-grade iron ore in the Mesabi Range.
[1890–95, Amer.; after the Taconic Range in New York and Massachusetts; see -ite1]