Iron silicates

Iron silicate Iron-silicon alloys Iron-silicon-chromium Iron sponge... 

An expanded mica (hydrated magnesium-aluminium-iron silicate). Used in lightweight aggregates, insulation, fertilizer and soil conditioners, as a filler in rubber and paints, and as a catalyst carrier. 

Magnetite is unstable relative to ferrous metasilicate (FeSi03) and so, under certain high-silica BW conditions, ferrous metasilicate may form in preference to magnetite. Iron silicate scales are exceedingly insoluble and adherent. 

Acmite, sodium iron silicate, NaFe(Si03)2... 

The first extensive study of iron-silicate minerals published was by deCoster and co-workers (7, 24). Their results are summarized in Table VI. Augite is a pyroxene containing considerable Na and Ca. No iron percentage was given for the olivine studies. The other minerals are included for comparison. The values given here for biotite are averages for their three untreated samples, which have two sites described as distorted octahedra. Heat treatment at 700°C. for one hour resulted in the emergence of a new Fe peak in biotite. 

Table VI. Mossbauer Parameters of Iron-Silicate Minerals Studied by deCoster, Poliak, and Amelinckx (7, 24) "...

Reaction 8.220 takes place in the silicate bands present in iron ores iron silicates occur in such bands in coexistence with opaline amorphous silica (Klein and Bricker, 1972). A complex Eh-pH diagram for the Fe-C-S-O-H system is shown in figure 8.22E. The stability field of pyrrhotite FeS disappears and is replaced by... 

Gruner, J. W. (1944). The composition and structure of minnesotaite, a common iron silicate in iron formations. Amer. Min. 29 363-372. 

The block iron silicate Si2 xFex Fe3ijFe 05(0H)4, cronstedtite, is representative of several mixed-valent minerals. Its structure consists of alternate layers of comer-shared tetrahedra and edge-shared octahedra. The tetrahedra Si " and Fe ions are coordinated by four oxide ions, the octahedral Fe " and Fe " ions share three common oxide ions with tetrahedral-site layers on one side and on the other are coordinated by three hydroxyl ions that hydrogen bond to the next tetrahedral-site layer. Mossbauer data at 35 K are able to resolve distinguishable Fe " and Fe " ions on the octahedral sites but in the range 300 < T < 500 K a rapid (t), < 10 s) charge transfer was found ... 

On April 18, 1821, he was elected to membership in the Swedish Academy of Sciences. In the same year he published some analyses of cyanite from St. Gotthard and Roras and nepheline and sodalite from Vesuvius (13). In 1822 he published analyses of cinnamon stone, chrysoberyl, and boracite (14). He found the cinnamon stone which Berzelius had brought back from Vermland to be a calcium aluminum iron silicate and regarded it as a true garnet like the one from Ceylon which Klaproth had analyzed. 

Gallup, D. L. 1989. Iron-silicate scale formation and inhibition at the Salton Sea geothermal field. Geothermics, 18, 97-103. 

Fegley, B. F. and Cameron, A. G. W. (1987) Avaporization model for iron/silicate fractionation in the Mercury protoplanet. Earth and Planetary Science Letters, 82, 207-222. 

Sulphate of eoda, Chloride of sodium Carbonate of soda, Hydrate of soda, Carbonate of lime, Oxysulphide of calcium SCaS + CaO], Sulphide of iron, Silicate of magnesia,. Charcoal, From Newe f tft.. ..23-57. , . 12-90. 34-76. . .. 4-74. . .. 2-02. From IftireAtila, Jildiurlsom. 25-64. 15-57., .. 1-22 4-28... 

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