Fayalite (Fe 2SiO 4, commonly abbreviated to Fa) is the iron-rich end-member of the olivine solid-solution series. In common with all minerals in the olivine...
6 KB (515 words) - 15:03, 3 May 2023
solid solution series. It is isomorphous with the iron-rich end-member, fayalite. Forsterite crystallizes in the orthorhombic system (space group Pbnm)...
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4) and fayalite (Fe-endmember: Fe 2SiO 4). Compositions of olivine are commonly expressed as molar percentages of forsterite (Fo) and/or fayalite (Fa) (e...
31 KB (3,176 words) - 03:33, 25 June 2024
temperature. The oxidation of the olivine occurs by an initial breakdown of the fayalite component, and subsequent reaction with the forsterite component, to give...
16 KB (1,628 words) - 12:51, 5 June 2024
Fe3O4 + O2 ⇌ 6 Fe2O3 NiNiO: nickel-nickel oxide: 2 Ni + O2 ⇌ 2 NiO FMQ: fayalite-magnetite-quartz: 3 Fe2SiO4 + O2 ⇌ 2 Fe3O4 + 3 SiO2 WM: wüstite-magnetite:...
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a slurry). Such is the case, for example, with the olivine (forsterite-fayalite) system, which is common in Earth's mantle. In chemistry, materials science...
10 KB (1,146 words) - 17:37, 3 June 2024
endmembers of the solid solution series: forsterite (Mg-endmember: Mg2SiO4) and fayalite (Fe-endmember: Fe2SiO4) but the ratio in olivine is not normally defined...
15 KB (1,855 words) - 01:00, 12 April 2024
Epidote Piemontite Erythrite Esperite Ettringite Euclase Eudialyte Euxenite Fayalite Feldspar subgroup: Andesine Albite Anorthite Anorthoclase Amazonite Bytownite...
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iron-rich end-members are considered separate minerals (forsterite and fayalite). The details of these rules are somewhat controversial. For instance,...
110 KB (13,012 words) - 21:01, 19 May 2024
solution of forsterite, the magnesium endmember of (Mg2+, Fe2+)2SiO4, and fayalite, the iron endmember, with forsterite typically making up about 90% of the...
30 KB (3,139 words) - 20:16, 5 January 2024
a group or series of minerals. For example, forsterite (Mg 2SiO 4) and fayalite (Fe 2SiO 4) are the two end-members of the olivine solid-solution series...
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Factor analysis, a statistical method Fanconi anemia, a genetic disease Fayalite, an olivine mineral Femtoampere (fA) Fluorescein angiography, for eye examination...
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2H+ + 2e− FeS + H2S + CO2 → FeS2 + HCOOH The reactions are: Reaction 1: Fayalite + water → magnetite + aqueous silica + hydrogen 3Fe2SiO4 + 2H2O → 2Fe3O4...
202 KB (20,886 words) - 19:57, 5 July 2024
trydimite are sometimes present along with the quartz. Biotite, augite, fayalite, and hornblende are common accessory minerals. Due to their high content...
20 KB (2,233 words) - 00:40, 16 May 2024
Ferrohortonolite is a mineral variety in the olivine series composed of 70% to 90% fayalite and 30% to 10% forsterite or Fe/(Fe+Mg) ratio of 0.7 to 0.9. It is from...
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Phenakite – Be2SiO4 Willemite – Zn2SiO4 Olivine group Forsterite – Mg2SiO4 Fayalite – Fe2SiO4 Tephroite – Mn2SiO4 Garnet group Pyrope – Mg3Al2(SiO4)3 Almandine...
20 KB (1,897 words) - 18:13, 5 February 2024
anions (a negatively charged ion). Iron silicate, Fe2SiO4, the mineral fayalite, is one of many examples of a ternary oxide. For many metal oxides, the...
12 KB (1,561 words) - 04:17, 27 June 2024
forsterite and fayalite whose general formula is (Fe,Mg)2SiO4. The reaction producing methane from olivine can be written as: Forsterite + Fayalite + Water +...
89 KB (8,702 words) - 03:05, 8 July 2024
Knebelite is a manganese variety of the fayalite-tephroite series with formula (Fe,Mn)2SiO4. It forms dark green orthorhombic crystals. It is reported...
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ferrosilite is stable only at elevated pressure, decomposing into quartz and fayalite at atmospheric pressure unless stabilized by magnesium or other impurities...
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Fe2O12W3 iron(III) orthotungstate Fe2P diiron phosphide 1310-43-6 Fe2SiO4 fayalite 13918-37-1 Fe3H2Na2O45Si chrysotile white asbestos 12001-28-4 Fe3O4 iron(II...
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dominant minerals, but these terms are now obsolete. Characteristic is the fayalite content (Fa) in olivine of 21 to 25 mol%. About 4–10% iron–nickel is found...
7 KB (668 words) - 08:24, 30 May 2023
series exists between tephroite and its analogues, the group endmembers fayalite and forsterite. Divalent iron or magnesium may readily replace manganese...
4 KB (226 words) - 04:07, 13 January 2024
Scanning Electron Microscope interface image of a fayalite-pyroxene symplectite (at right) in a Martian meteorite...
4 KB (506 words) - 03:16, 2 July 2017
minerals are bronzite (an orthopyroxene), and olivine. Characteristic is the fayalite (Fa) content of the olivine of 16 to 20 mol%. They contain also 15–19%...
4 KB (368 words) - 08:11, 24 December 2022
and olivine if it is present as Fe2+; Fe3+ cannot enter the lattice of fayalite olivine and thus for every two Fe3+ ions, one Fe2+ is used and one molecule...
10 KB (1,217 words) - 21:07, 8 April 2024
cell is somewhat larger than for the calcium free olivines forsterite and fayalite with a = 0.4815 nm, b = 1.108 nm and c = 0.637 nm, and for monticellite...
4 KB (280 words) - 21:46, 3 January 2024
present as iron oxide (FeO) in the silicates; olivine contains 26 to 32 mol% fayalite (Fa). The most abundant minerals are hypersthene (a pyroxene) and olivine...
4 KB (375 words) - 04:23, 10 July 2024
Fayalite (Olivine)3 Fe2SiO4 + water2 H2O → Magnetite2 Fe3O4 + Silica (aqueous)3 SiO2 + Hydrogen2 H2 (Hydrogenesis)...
34 KB (3,778 words) - 02:15, 9 January 2024
of Forsterite and Fayalite metamorphoses into serpentine, magnetite and silica by the following reactions, with silica from fayalite decomposition (reaction...
70 KB (7,717 words) - 19:01, 26 June 2024