ilmenite


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Related to ilmenite: magnetite, rutile

ilmenite

(ĭl`mĕnīt), black mineral, iron titanium oxide, FeTiO3, crystallizing in the hexagonal system. It is sometimes found as tabular hexagonal crystals but occurs more commonly as small grains in igneous and metamorphic rocks and in sands derived from them. Ilmenite has been noted as an important constituent of lunar rocks. It is the commonest titanium mineral and is the most important source of this element and its compounds. Over 3 million tons of ilmenite are mined annually; important producers are the United States, Canada, Australia, and Norway.

Ilmenite

 

(named after the deposit in the Il’men Mountains, where ilmenite was first found), a mineral whose composition is FeTi03 (47.34 percent FeO and 52.66 percent Ti02). Its composition is not constant. Fe2+ is replaced isomorphically by Mg2+ and Mn2+ ; correspondingly, ilmenite may contain up to 17 percent MgO (magnesian ilmenite) and 14 percent MnO (manganoan ilmenite). Admixtures of Nb, V, Cr, Co, and Ni are also known.

Ilmenite crystallizes in the trigonal system; it sometimes forms complex rhombohedral crystals and, more frequently, granular masses and continuous agglomerates of black color with a bright submetallic luster. Nontransparent and magnetic, ilmenite has a hardness of 5–6 on the mineralogical scale and a density of 4,600 to 4,800 kg/m2. The crystalline structure of ilmenite is similar to that of hematite, which often occurs in ilmenite as a solid solution or as a product of its decay. In the crystallization of natural ore melts high in Ti with an excess of FeO and Fe203, so-called titanomagnetites are formed. Deposits of ilmenite (and titanomagnetites) are connected with gabbroid type igneous rocks. It is known as a magmatic mineral in kimberlites, forms agglomerates in alkaline syenite pegmatites, and accumulates in placer deposits. In the USSR deposits are found in the southern and central Urals, in the Altai, on the Kola Peninsula, and in the Ukraine. Ilmenite is a valuable ore for obtaining titanium and its derivatives, which are widely used in metallurgy and the chemical and other industries.

G. P. BARSANOV

ilmenite

[il·mə‚nīt]
(mineralogy)
FeTiO3 An iron-black, opaque, rhombohedral mineral that is the principal ore of titanium. Also known as mohsite; titanic iron ore.

ilmenite

A mineral which is commonly used as an aggregate in high-density concrete; also called iron titanate.
References in periodicals archive ?
From the feedstocks ilmenite, rutile, and titanium slag up to the sales markets, information on the regions Western Europe, Eastern Europe, North America, South America, Asia-Pacific, the Middle East, and Africa is given.
Market Segment by Regions, this report splits Global into several key Region, with production, consumption, revenue, market share and growth rate of Ilmenite in these regions, from 2011 to 2021 (forecast), like North America, China, Europe, Japan, India, Southeast Asia split by product type, with production, revenue, price, market share and growth rate of each type Split by application, this report focuses on consumption, market share and growth rate of Ilmenite in each application, can be divided into Supplements, Food, Feed, Cosmetics.
That makes more sense," Jolliff said, "because iron-enriched olivine and ilmenite are more likely to occur together.
The in-plane orientation of the hematite-ilmenite needles and platelets, and the similar crystal structure of hematite and ilmenite to corundum, suggest that the basal pinacoid direction of the inclusions and the host are parallel.
Analyses of titanite, ilmenite, biotite, plagioclase and chlorite were performed using a CAMECA SX 100 electron microprobe working in WDX mode at the Institute of Geological Sciences, Masaryk University Brno and at Mineralogical Institute, Leibniz University Hannover, Germany.
The mineralogical analysis of beach as well as dune samples indicates that both the samples contain significant amount of ilmenite and also associated with other heavy minerals such as garnet, sillimanite, rutile and zircon.
First production from the Fort Dauphin project is expected in late 2008 and the initial capacity will be 750,000 tonnes per year of ilmenite.
The compositions of coexisting magnetite and ilmenite can be used to estimate liquidus temperatures and oxygen fugacity (Andersen and Lindsley, 1988) of magmas, although subsolidus exsolution produces intergrowths that complicate application of the geothermometer/oxygen barometer in slowly cooled, coarse-grained rocks.
Rutile production will account for some 50% of projected revenues, while ilmenite and zircon will account for about 25% each.
Bulk spiral concentrates have shown a product mix comprising nearly 18% rutile/leucoxene, 49% ilmenite and more than 25% zircon.
A well-known locality northeast of Georgetown, El Dorado County, California, where fine quartz crystals exceeding 40 cm in size were mined from the 1930's to the 1980's, has yielded fine crystals of brookite, anatase, ilmenite and clinochlore.
While this has removed a major component of ilmenite supply from the market, it comes at a time of declining demand and hence will have little immediate impact on the overall market situation for titanium minerals.