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[mag-ni-tahyt] /ˈmæg nɪˌtaɪt/
a very common black iron oxide mineral, Fe 3 O 4 , that is strongly attracted by magnets: an important iron ore.
Origin of magnetite
1850-55; magnet + -ite1; compare German Magnetit Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for magnetite
Historical Examples
  • Deposits of iron ore accumulated in the several ways referred to above may be metamorphosed and changed to hematite and magnetite.

    North America Israel C. Russell
  • The minerals at contact are quartz, biotite, magnetite and hornblende.

    The Long Labrador Trail Dillon Wallace
  • magnetite is loadstone ore; the powder is reddish black, and the ore, dark brown to black.

    The A B C of Mining Charles A. Bramble
  • There is some sericite present, also magnetite, resulting from the decomposition of the biotite.

    The Long Labrador Trail Dillon Wallace
  • Here the magnetite forms a great tabular vertical body lying between porphyry and syenite.

  • It is also somewhat stained by the decomposition of the magnetite.

    The Long Labrador Trail Dillon Wallace
  • Haematite is sometimes magnetic, and A. Liversidge has shown that magnetite is probably present.

  • The usual association with apatite and magnetite crystals is noted.

    Mount Rainier Various
  • magnetite is often accompanied by rocks containing garnet, epidote and hornblende.

    The A B C of Mining Charles A. Bramble
  • magnetite, an oxide of iron, has developed a candle-power with but one half of one watt.

    Inventors at Work George Iles
British Dictionary definitions for magnetite


a black magnetic mineral, found in igneous and metamorphic rocks and as a separate deposit. It is a source of iron. Composition: iron oxide. Formula: Fe3O4. Crystal structure: cubic
Derived Forms
magnetitic (ˌmæɡnɪˈtɪtɪk) adjective
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
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Word Origin and History for magnetite

magnetic iron ore, 1840, from German magnetit; see magnet + -ite (2).

Online Etymology Dictionary, © 2010 Douglas Harper
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magnetite in Science
A brown to black mineral that is strongly magnetic. It crystallizes in the cubic system and commonly occurs as small octahedrons. Magnetite occurs in many different types of rock and is an important source of iron. Chemical formula: Fe3O4.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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