[fer-oh-mag-nee-zhuhn, -shuhn]
adjective Mineralogy.
(of minerals and rocks) containing iron and magnesium.

1900–05; ferro- + magnesian

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World English Dictionary
ferromagnesian (ˌfɛrəʊmæɡˈniːʒən)
(of minerals such as biotite) containing a high proportion of iron and magnesium

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
ferromagnesian   (fěr'ō-māg-nē'zhən)  Pronunciation Key 
Containing iron and magnesium. Magnetite and hornblende are ferromagnesian minerals.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The chlorite forms dark-green clots, probably derived from alteration of ferromagnesian minerals.
Igneous rock composed chiefly of dark-colored ferromagnesian silicate minerals.
The crystal structures and crystal chemistry of ferromagnesian amphiboles.
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