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Containing iron and magnesium.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Minerals) (of minerals such as biotite) containing a high proportion of iron and magnesium
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌfɛr oʊ mægˈni ʒən, -ʃən)

(of minerals and rocks) containing iron and magnesium.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Ryan PC, Hillier S, Wall AJ (2008) Stepwise effects of the BCR sequential chemical extraction procedure on dissolution and metal release from common ferromagnesian clay minerals: A combined solution chemistry and X-ray powder diffraction study.
[USPRwire, Tue Oct 09 2018] Pyroxenite is an ultrabasic rock that consists of minerals that belong to the pyroxenes group-- predominantly, ferromagnesian minerals other than olivine.
Chlorites are ubiquitous ferromagnesian phyllosilicates most commonly found in epimetamorphic rocks as hydrothermal alteration products and after erosion in sediments together with various clay minerals [1, 2].
The calcite cement found in [S.sub.4] is mainly composed of microcrystalline calcite, clay minerals, and extremely low amounts of ferromagnesian and quartz.
Textures, involving grain sizes, grain shapes, grain orientations, and grain inter-relations, are difficult to quantify, but the human brain is an excellent patternrecognition machine, and we can commonly determine at a glance whether one texture is a good match for another, particularly in the matter of grain size, modal proportions of felsic and ferromagnesian minerals, and grain orientations.
The higher percentages of the Fe2O3 and MgO (Fe2O3+MgO: 11.55; UCC: 7.23) along with the consistent ratios of TiO2/Al2O3 (mean: 0.05), is attributed to the higher proportion of ferromagnesian minerals, derived from mafic and ultramafic rocks.
It has been suggested that variations in MS are related to changes in lithogenic (aqueous, detrital and aeolian) inputs during transgressive-regressive cycles, which in turn results in changes in the amount of iron, clay and ferromagnesian constituents (e.g.
A general equation for estimating Fe3+ concentrations in ferromagnesian silicates and oxides from microprobe analyses, using stoichiometric criteria.
The depleted content of Fe and Mn in this groundwater is attributed to the poverty of ferromagnesian minerals in the water bearing sediments in the desert areas of Nile valley (Omer 2003; Gomaa 2006).
The elements in the study area are compatible elements and have high positive correlation coefficient, so that the highest correlation is related to presence of nickel and cobalt elements (0.829).This correlation can be due to similar geochemical behavior of these elements, such that these elements can be in the early stages of magmatic differentiation replacement of each other in a structure of ferromagnesian minerals of ultramafic rocks [5].
It was concentrated in early magmatic ferromagnesian minerals in mafic rocks and hence was depleted in the residual late magmatic hydrothermal fluids.