Ilmenite

FeTiO 3

[Chemical composition] The composition usually contains a mixture of Mg, Nb, Ta, Mn and the like. Above 960 ° C, titanium and iron ore hematite is formed completely isomorphic, i.e. when the temperature is lowered from the melting occurs, it is often ilmenite containing inclusions of hematite fine scale flake.

[Crystal Structure] Trigonal System; 360 screenshot20170720091432528 a 0 =0.509 nm, c 0 =1.407 nm; Z=6. The crystal structure is a corundum -derived structure. The difference from corundum is that the position of aluminum is replaced by iron and titanium, resulting in the disappearance of the c-slip surface and the reduced symmetry of the ilmenite crystal lattice. Under high temperature conditions, Fe and Ti in ilmenite are disordered and have a corundum structure.

[Form] Single crystal is rare, occasionally thick plate-like; usually irregularly fine-grained, scaly. It can be seen that (0001) and (101) are twin crystal.

[Physical properties] steel gray to black iron; black streaks, are brownish-containing hematite; ~ metal semi-metallic luster; opaque. No clerk. Hardness 5 to 6. The relative density is 4.72. Weak magnetic.

[genesis and occurrence] are mainly formed in the process of magma and pegmatite. It often appears as a by-product of various types of magmatic rocks. In the vanadium- titanium magnetite deposit associated with the basic rock, the ilmenite is distributed in the form of particles or flakes between the magnetite particles, or oriented along the direction of the magnetite {111} mesh, resulting in magnetic The {111} crack of the iron ore is due to the dissolution of the magnetite ilmenite solid solution formed above 550 °C when the temperature is lowered, and the separated ilmenite is floating from the {0001} plane (or Produced on the {111} surface of magnetite, causing {111} cracking of magnetite. China's Sichuan Panzhihua vanadium-titanium magnetite deposit is one of the world's famous producers of ilmenite.

[identification characteristics] According to its crystal shape, streaks and weak magnetic properties, it is distinguished from its similar hematite and magnetite. However, the particles are not easily identified when they are fine, and they need to be identified by chemical methods or under a microscope.

[Main use] is an important ore mineral of titanium.

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