an iron-bearing chert containing from 25 to 35 percent hematite and magnetite: it is a low-grade iron ore that is pelletized for blast-furnace reduction
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'taconite'
old name for rock formations first identified in the Taconic Range (in Vt. and Mass.)