The chemical composition of the alteration products of ilmenite frequently fluctuates within definite ranges (pseudoilmenite and. adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A cit., p. 90. Leucoxene is not a mineral because it lacks defined crystal structure and its chemical composition is far too variable to be expressed as a chemical formula. Found inside – Page 360Table 18.1 Titanium minerals and their chemical compositions with TiO2 ... FeTiO3 40–65 Leucoxene Fe2O3TiO2 60–90 Perovskite CaTiO3 40–60 Titanite CaTiSiO3 ... Typical composition of titanium-iron oxide minerals on the FeO–Fe 2 O 3 –TiO 2 diagram (small dots), and typical composition ranges of titanium ores and concentrates (shadowed areas). Found inside – Page 42The , magnetite is usually partly altered to the substance of unknown composition termed leucoxene . ... Since this determination was based on chemical tests as well as on microscopic examination , it is presumably correct for much of the so ... Found inside – Page 695... by leucoxene, which resulted in pale yellow colouration (Figs. ... Chemical compositions of the rocks are presented in Appendices 20 and 21. Characterization step TiZir Geometallurgy RUTILE Rutile 96,4% LEUCOXENE Rutile 76,1% Pseudorutile 4,9% The weathering process removes iron, so leucoxene can be much higher grade than ilmenite, up to 90% TiO2. Along with rutile, it is used as a feedstock for the chlorite process, and therefore tends to track the rutile price. High grade leucoxene, say 86 to 90% TiO2, will typically command 80-85% of the rutile price. Pictures, Composition, Geology, Occurrence, and Uses of Rutile. Chemical Formula: Fe++TiO3. Substances such as H 2 O, SiO 2 , S, Co 2 , K, Na, Ca, Mg, B, F, and so on are introduced into the rocks or transferred from one place to another. Found inside – Page 246The chemical and geochemical composition of leucoxene from different layers of the section proves that some of them have the inherited set of elements from the Riphean leucoxene . In the lower place besides the above mentioned leucoxene ... Most of the ilmenite mined worldwide is used to manufacture titanium dioxide, TiO 2, an important pigment, whiting, and polishing abrasive. Rutile also occurs as needle-shaped crystals in other minerals. Materials and experiments 2.1 Materials Leucoxene in most instances develops from hydrated ilmenite or pseudorutile but may also replace the ilmenite. Gilmbel,z in 1874, was the first to describe substance as he found it in diabase and named it leucoxene. 37 Full PDFs related to this paper. Found inside – Page 15Titanomagnetite is also a prominent constituent , the character being indicated by opaque rims of leucoxene about many crystals . Chemical composition . It varies in color from yellow to brown. The mineral is insoluble in acids. Found inside – Page 274A small amount of felspar was also present , but not in sufficient amount to mask the composition of the leucoxene in a chemical analysis . An attempt was made to reduce the ilmenite content still further by stewing the powder for an hour in 1 ... Found inside – Page 64I. See Volkov , A. N. Edwards , A. B. The chemical composition of leucoxene in Cainozoic bauxite from Boolarra , Victoria : Mineralog . Mag . , v . Found inside – Page 11An approach to the problem from the chemical side meets with difficulty because of the uncertainty regarding the chemical composition of leucoxene . Cathrein ' s14 analysis of leucoxene separated from diabase showed considerable Cal and ... Found inside – Page 913913-918 AN X - RAY STUDY OF LEUCOXENE FROM QUILON , INDIA M. D. KARKHANAVALA , A. C. MOMIN , AND ... Its nature and chemical composition are known to be variable ( 1 , 11 ) , yet leucoxene is commonly considered ( 2 , 3 , 4 , 8 ... The data on the chemical composition of the leucoxene fraction are given in Table 2. With just a glance it can easily be confused with hematite and magnetite. The density varies between 4.2 and 5.6 and is a function of substitution by high field strength elements in the rutile crystal lattice10. The chemical composition of natural leucoxene, as analyzed by the X-ray fluorescence technique (XRF), consists mainly of TiO 2 (91.3%), Fe 2 O 3 (4.01%), SiO 2 (0.51%), and ZrO 2 (1.49%). Found inside – Page 27Leucoxene and ilmenite occur in bauxite from Arkansas that averages about ... Variations in chemical composition of ore minerals generally accompany a ... Found inside – Page 11An approach to the problem from the chemical side meets with difficulty because of the uncertainty regarding the chemical composition of leucoxene . Cathrein's14 analysis of leucoxene separated from diabase showed considerable Cal and ... concentrate of ilmenite-leucoxene ore, we should consider possibility of their removal or dissolution. The chemical composition of the alteration products of ilmenite frequently fluctuates within definite ranges (pseudoilmenite and. Found inside – Page 120Owing to its somewhat weathered condition and lack of knowledge as to the accurate chemical constituents of the resulting chloritic and serpentinous ... The results of the studies on the Yaregskoye deposit quartz-leucoxene rougher concentrate representative sample are presented, this titanium deposit being the largest in Russia. Leuco xene is not a mineral because it lacks defined crystal structure and its chemical composition is far too variable to be expressed as a chemical formula. The grains are most often grayish white with often a start of leucoxene alteration on their border or along small cracks. The grains showed a great variation in magnetic susceptibility linked to their difference in chemical composition and to the different degrees of deterioration. Found inside – Page 274A small amount of felspar was also present , but not in sufficient amount to mask the composition of the leucoxene in a chemical analysis . An attempt was made to reduce the ilmenite content still further by stewing the powder for an hour in 1 ... The hydrothermal treatment could remove portions of the impurities, e.g. Vein-like ‘leucoxene’ is also observed in association with organics. Chemical treatment of tusin yields technical silicon carbide. The chemical composition of natural leucoxene minerals was analyzed by X-ray fluorescence techniques (XRF). chemical composition of TiO 2. AssocrarBo GnRvwecrps The Franciscan sandstones have a texture and mineralogy typical of graywacke; fresh grains of quartz,feldspar, chert and basic rock fragments ... in the chemical composition of graywackes from widely separated rocali-ties. Chemical Composition of the QLC. Samokhin . Found inside – Page 667have the chemical composition and x - ray struc- anatase patterns . ... 5 , Table 6 ) , furnished by of leucoxene and other titanium minerals in the U. S. National Museum differs from the connection with the study of diaspore clays of original ... adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A A short summary of this paper. Leucoxene is not a mineral because it lacks defined crystal structure and its chemical composition is far too variable to be expressed as a chemical formula. 1 tabulates the chemical composition of natural leucoxene minerals was analyzed by X-ray fluorescence (...... 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