leucoxene


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leucoxene

[lü′käk‚sēn]
(mineralogy)
A mineral composed of rutile with some anatase or sphene; occurs in igneous rocks, usually as an alteration product of ilmenite.
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As a result, the feldspar may be cloudy and/or replaced locally by white mica, the biotite may be chloritized and the opaque oxide partially replaced by leucoxene.
Titanium dioxide" is the generic term for ilmenite, leucoxene, natural and synthetic rutile, as well as titanium slag.
Essence of the liquid-phase process consists in performance of electrochemical decomposition of mixed titanium oxides, such as molten titanium slag, ilmenite, perovskite, leucoxene, titanite, natural and synthetic rutile, which are in liquid state.
Tenders are invited for Electrification work in leucoxene circuit
These minerals are accompanied by plenty of secondary amphibole chlorite epidote (one or more of the three phases abundant in some rocks) titanite and leucoxene.
Different kinds of mineral alterations taking place in the Devonian sequence during post-sedimentary processes have been studied: formation of authigenic leucoxene, anatase, apatite, pyrite, and goethite, dissolution of garnet, staurolite and kyanite, replacement of magnetite, amphiboles, titanium-bearing minerals and feldspar, formation of authigenic overgrowths of detrital feldspar grains (Kleesment & Paap 1978; Kleesment 1984, 1998).
The operation is expected to produce 250K-mt/yr Ti slag by 2005, as well as zircon, leucoxene, and rutile.
The study envisages a A$167 million project with a throughput of 12 Mt/y, and a production target of 55,000 t/y of rutile, 40,000 t/y of zircon, 165,000 t/y of ilmenite and 100,000 t/y of leucoxene and pseudorutile.
These show abundant growth figures on the crystal faces, and a prominent cleavage; a thin film of leucoxene invades some of the cleavage planes.
The banded appearance is actually a shear fabric with basalt altered to sericite/muscovite + dolomite +/- leucoxene +/- quartz.
Allanite, sphene and leucoxene occur as minor accessories along with local epidote (Jan et al.