ferromagnesian

American  

[fer-oh-mag-nee-zhuhn, -shuhn] / ˌfɛr oʊ mægˈni ʒən, -ʃən /

adjective

Mineralogy.

1. (of minerals and rocks) containing iron and magnesium.

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ferromagnesian British  

/ ˌfɛrəʊmæɡˈniːʒən /

adjective

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

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ferromagnesian Scientific  

/ fĕr′ō-măg-nē′zhən /

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

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Etymology

Origin of ferromagnesian

First recorded in 1900–05; ferro- + magnesi(um) ( def. ) + -an ( def. )

Example Sentences

Aluminum concentrates in soils as feldspar and ferromagnesian minerals in igneous and metamorphic rocks undergo chemical weathering processes.

From Textbooks • Jan. 1, 2017

These dark ferromagnesian minerals are commonly found in gabbro, basalt, diorite, and often form the black specks in granite.

From Textbooks • Jan. 1, 2017

Some silicate minerals include iron or magnesium and are called ferromagnesian silicates.

From Textbooks • Jan. 1, 2015

In classifying intrusive igneous rocks, the first thing to consider is the percentage of ferromagnesian silicates.

From Textbooks • Jan. 1, 2015

The ferromagnesian minerals crystallize comparatively early and have some idiomorphism; the felspar usually follows and only in part shows good crystalline outlines.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" by Various