A variety of chert containing magnetite and hematite, mined as an iron ore. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "taconite" in a sentence
"All that land is filled with taconite, which is the stuff they turn into iron."
"Jaros said 2,500 pounds of iron ore pellets, also known as taconite, would be extracted from the ship at one time and deposited in an onshore scale."
"Bar tops in the fireplace-warmed "Bulldog Lounge" are made from local taconite rock, flecked with red iron ore; walls are inlaid with Minnesota stone and the decorative panels are made of wood salvaged from old grain elevators."