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

Thus magnetite, apatite and picotite, with olivine, may be enclosed in augite, hornblende, and hypersthene, sometimes with a later growth of biotite, while the felspars occupy the interspaces between the clusters of ferromagnesian minerals.

From Project Gutenberg

A fluxion structure or flow banding also can be observed in some of the rocks of this series, and is characterized by the occurrence of parallel sinuous bands of dark colour, rich in ferromagnesian minerals, and of lighter shades in which felspars predominate.

From Project Gutenberg

Biotite and all ferromagnesian minerals rarely appear in them, and never are in considerable amount.

From Project Gutenberg

As they are richer in the dark coloured ferromagnesian minerals they are usually grey or dark grey, and have a higher specific gravity than granite.

From Project Gutenberg

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 Project Gutenberg