taconite

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tac·o·nite

 (tăk′ə-nīt′)
n.
A variety of chert containing magnetite and hematite, mined as an iron ore.

[After the Taconic (Mountains).]

taconite

(ˈtækəˌnaɪt)
n
(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]

tac•o•nite

(ˈtæk əˌnaɪt)

n.
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]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.taconite - a variety of chert containing magnetite and hematite; mined as a low-grade iron ore
chert - variety of silica containing microcrystalline quartz
iron ore - an ore from which iron can be extracted