Also found in: Wikipedia.


Containing iron and magnesium.


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


(ˌfɛr oʊ mægˈni ʒən, -ʃən)

(of minerals and rocks) containing iron and magnesium.
References in periodicals archive ?
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.
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.
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).
On the other hand, depletion of Mg and Mn from the system is related to decomposition of ferromagnesian minerals.
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].
1987): A general equation for estimating Fe3+ concentrations in ferromagnesian silicates and oxides from microprobe.
Biotite is a common hydrated ferromagnesian silicate in most mafic, intermediate and felsic plutonic rocks which related to Mn metal species and confirmed by another g signal which appear at a lower magnetic field 3700 G.
However, in the study area, the sources of the iron and manganese can be attributed to weathering of iron and manganese bearing minerals and rocks, such as amphiboles, ferromagnesian micas and magnetite.
The texture of andesite is generally porphyritic, with phenocrysts of feldspar and ferromagnesian minerals.