ferromagnesian

American  

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

adjective

Mineralogy.

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

---

ferromagnesian British  

/ ˌfɛrəʊmæɡˈniːʒən /

adjective

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

---

ferromagnesian Scientific  

/ fĕr′ō-măg-nē′zhən /

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

---

Etymology

Origin of ferromagnesian

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

Example Sentences

Mafic minerals are also referred to as dark-colored ferromagnesian minerals.

From Textbooks • Jan. 1, 2017

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

From Textbooks • Jan. 1, 2015

The equation shown here is for olivine, but it could apply to almost any other ferromagnesian silicate, including pyroxene, amphibole, or biotite.

From Textbooks • Jan. 1, 2015

It is a “stony” meteorite that is dominated by ferromagnesian silicate minerals, and is similar in composition to Earth’s mantle.

From Textbooks • Jan. 1, 2015

It is rare to find the pure types of “hornblende-diorite,” “augite-diorite,” &c., but in most cases the rocks contain two or more ferromagnesian silicates, and such combinations as “hornblende-biotite-diorite” are commonest in nature.

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