taconite

[tak-uh-nahyt]
noun
  1. a low-grade iron ore, containing about 27 percent iron and 51 percent silica, found as a hard rock formation in the Lake Superior region.

Origin of taconite

1890–95, Americanism; named after the Taconic mountain range (east of the Hudson River); see -ite1
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British Dictionary definitions for taconite

taconite

noun
  1. a fine-grained sedimentary rock containing magnetite, haematite, and silica, which occurs in the Lake Superior region: a low-grade iron ore

Word Origin for taconite

C20: named after the Taconic Mountains in New England
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012