• synonyms


[fer-oh-mag-nee-zhuh n, -shuh n]
adjective Mineralogy.
  1. (of minerals and rocks) containing iron and magnesium.
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Origin of ferromagnesian

First recorded in 1900–05; ferro- + magnesi(um) + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ferromagnesian

Historical Examples of ferromagnesian

  • Biotite and all ferromagnesian minerals rarely appear in them, and never are in considerable amount.

    Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2


  • Hornblende and biotite are the ferromagnesian constituents and vary much in relative importance.

British Dictionary definitions for ferromagnesian


  1. (of minerals such as biotite) containing a high proportion of iron and magnesium
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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

ferromagnesian in Science


  1. Containing iron and magnesium. Magnetite and hornblende are ferromagnesian minerals.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.