Ilmenite
The ilmenite is a Oxyde Minéral of Fer and Titane of Chemical formula FeTiO3 which belongs to the crystalline Système trigonal. Its network is rhomboedric and its Groupe of space is . It is in the metamorphic and plutonic rocks basic.
The structure of the ilmenite is primarily the same one as that of the Hématite, which allows a solid Solution complete at high temperature; the distribution of the cations Iron and Titane in hematite is ordered. The oxygen atoms form a stacking of the type AB, the cations occupy two thirds of the octahedral cavities thus formed. Since in hematite, each third octahedral site is empty: the sequence is - Fe-Ti-L-Ti-FE-L-Fe-Ti where L represents a gap (octahedral site empties). The cations close to the vacant site are always either two Fer, or two Titane.
The ilmenite forms two isomorphous series with the Pyrophanite MnTiO3 and the Geikielite MgTiO3. One finds the same structure in MgSiO3 with high pressure.
With ambient Temperature, the ilmenite is Paramagnétique, but it becomes antiferromagnetic to approximately 55 K.
The ilmenite is important a Minerai of titanium and, to a lesser extent of iron.
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