[fer-oh-mag-nee-zhuh n, -shuh n]

adjective Mineralogy.

(of minerals and rocks) containing iron and magnesium.

Origin of ferromagnesian

First recorded in 1900–05; ferro- + magnesi(um) + -an
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Historical Examples of ferromagnesian

British Dictionary definitions for ferromagnesian



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



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