ferromagnesian

[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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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
Various
Hornblende and biotite are the ferromagnesian constituents and vary much in relative importance.
Mount Rainier
Various

British Dictionary definitions for ferromagnesian

ferromagnesian

adjective

(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

ferromagnesian

[fĕr′ō-măg-nē′zhən]

Containing iron and magnesium. Magnetite and hornblende are ferromagnesian minerals.