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).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The silicate ferruginous quartzites (taconites) in the Johvi zone are also likely of volcanic origin.