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- Fayalite abstract "Fayalite (Fe2SiO4; commonly abbreviated to Fa), also called iron chrysolite, is the iron-rich end-member of the olivine solid-solution series. In common with all minerals in the olivine group, fayalite crystallizes in the orthorhombic system (space group Pbnm) with cell parameters a 4.82 Å, b 10.48 Å and c Å 6.09.Fayalite forms solid solution series with the magnesium olivine endmember forsterite (Mg2SiO4) and also with the manganese rich olivine endmember tephroite (Mn2SiO4).Iron rich olivine is a relatively common constituent of acidic and alkaline igneous rocks such as volcanic obsidians, rhyolites, trachytes and phonolites and plutonic quartz syenites where it is associated with amphiboles. Its main occurrence is in ultramafic volcanic and plutonic rocks and less commonly in felsic plutonic rocks and rarely in granite pegmatite. It also occurs in lithophysae in obsidian. It also occurs in medium-grade thermally metamorphosed iron-rich sediments and in impure carbonate rocks.Fayalite is stable with quartz at low pressures, whereas more magnesian olivine is not, because of the reaction olivine + quartz = orthopyroxene. Iron stabilizes the olivine + quartz pair. The pressure and compositional dependence of the reaction can be used to calculate constraints on pressures at which assemblages of olivine + quartz formed.Fayalite can also react with oxygen to produce magnetite + quartz: the three minerals together make up the "FMQ" oxygen buffer. The reaction is used to control the fugacity of oxygen in laboratory experiments. It can also be used to calculate the fugacity of oxygen recorded by mineral assemblages in metamorphic and igneous processes.At high pressure, fayalite undergoes a phase transition to ahrensite, the iron-bearing analogue of ringwoodite, i.e., contrary to forsterite there is no intermediate form analogous to wadsleyite; under the conditions prevailing in the upper mantle of the Earth, the transition would occur at ca. 6–7 GPa, i.e., at substantially lower pressure than the phase transitions of forsterite. In high-pressure experiments, the transformation may be delayed, so that it may remain stable to pressures of almost 35 GPa (see fig.), at which point it may become amorphous rather than take on a crystalline structure such as ahrensite.The name fayalite is derived from Faial (Fayal) Island in the Azores where it was first described in 1840.".
- Fayalite thumbnail Fayalite_crystal_group_-_Ochtendung,_Eifel,_Germany.jpg?width=300.
- Fayalite wikiPageID "1245859".
- Fayalite wikiPageLength "5356".
- Fayalite wikiPageOutDegree "46".
- Fayalite wikiPageRevisionID "650204215".
- Fayalite wikiPageWikiLink Amphibole.
- Fayalite wikiPageWikiLink Azores.
- Fayalite wikiPageWikiLink Category:Iron_minerals.
- Fayalite wikiPageWikiLink Category:Nesosilicates.
- Fayalite wikiPageWikiLink Faial_Island.
- Fayalite wikiPageWikiLink Felsic.
- Fayalite wikiPageWikiLink Forsterite.
- Fayalite wikiPageWikiLink Fugacity.
- Fayalite wikiPageWikiLink Granite.
- Fayalite wikiPageWikiLink H-M_symbol.
- Fayalite wikiPageWikiLink Hermann–Mauguin_notation.
- Fayalite wikiPageWikiLink Igneous.
- Fayalite wikiPageWikiLink Igneous_rock.
- Fayalite wikiPageWikiLink Iron.
- Fayalite wikiPageWikiLink Lithophysa.
- Fayalite wikiPageWikiLink Lithophysae.
- Fayalite wikiPageWikiLink Magnesium.
- Fayalite wikiPageWikiLink Magnetite.
- Fayalite wikiPageWikiLink Manganese.
- Fayalite wikiPageWikiLink Metamorphic_rock.
- Fayalite wikiPageWikiLink Mineral_redox_buffer.
- Fayalite wikiPageWikiLink Nesosilicate.
- Fayalite wikiPageWikiLink Obsidian.
- Fayalite wikiPageWikiLink Olivine.
- Fayalite wikiPageWikiLink Orthopyroxene.
- Fayalite wikiPageWikiLink Orthorhombic.
- Fayalite wikiPageWikiLink Orthorhombic_crystal_system.
- Fayalite wikiPageWikiLink Oxygen.
- Fayalite wikiPageWikiLink Pegmatite.
- Fayalite wikiPageWikiLink Phonolite.
- Fayalite wikiPageWikiLink Pluton.
- Fayalite wikiPageWikiLink Plutonic.
- Fayalite wikiPageWikiLink Pyroxene.
- Fayalite wikiPageWikiLink Quartz.
- Fayalite wikiPageWikiLink Rhyolite.
- Fayalite wikiPageWikiLink Ringwoodite.
- Fayalite wikiPageWikiLink Silicate_minerals.
- Fayalite wikiPageWikiLink Space_group.
- Fayalite wikiPageWikiLink Syenite.
- Fayalite wikiPageWikiLink Tephroite.
- Fayalite wikiPageWikiLink Trachyte.
- Fayalite wikiPageWikiLink Ultramafic.
- Fayalite wikiPageWikiLink Ultramafic_rock.
- Fayalite wikiPageWikiLink Volcanic.
- Fayalite wikiPageWikiLink Volcano.
- Fayalite wikiPageWikiLink Wadsleyite.
- Fayalite wikiPageWikiLink File:Atomic_structure_of_olivine_1.png.
- Fayalite wikiPageWikiLink File:Fayalite-pV.svg.
- Fayalite wikiPageWikiLinkText "Fayalite".
- Fayalite wikiPageWikiLinkText "fayalite".
- Fayalite wikiPageWikiLinkText "fayalitic".
- Fayalite 2v "Measured: 74° to 47°, Calculated: 54° to 66°".
- Fayalite birefringence "δ = 0.042 – 0.051".
- Fayalite caption "Fayalite crystal group from Ochtendung, Eifel, Germany".
- Fayalite category Nesosilicate.
- Fayalite category Silicate_minerals.
- Fayalite cleavage "{010} moderate, {100} imperfect".
- Fayalite color "Greenish yellow, yellow-brown, brown; pale yellow to amber in thin section".
- Fayalite diaphaneity "Transparent".
- Fayalite formula "Fe2SiO4".
- Fayalite fracture "Conchoidal".
- Fayalite gravity "4.392".
- Fayalite habit "Commonly granular, compact, or massive".
- Fayalite hasPhotoCollection Fayalite.
- Fayalite luster "Vitreous to resinous on fractures".
- Fayalite mohs "6.5".
- Fayalite name "Fayalite".
- Fayalite opticalprop "Biaxial".
- Fayalite pleochroism "Faint".
- Fayalite refractive "nα = 1.731 – 1.824 nβ = 1.760 – 1.864 nγ = 1.773 – 1.875".
- Fayalite streak "White".
- Fayalite strunz "9".
- Fayalite symmetry H-M_symbol.
- Fayalite symmetry Hermann–Mauguin_notation.
- Fayalite symmetry "Orthorhombic dipyramidal".
- Fayalite symmetry "Space group: Pbnm".
- Fayalite system "Orthorhombic Dipyramidal".
- Fayalite twinning "On [100]; also on [031], as trillings".
- Fayalite unitCell "a = 4.8211 Å, b = 10.4779 Å, c = 6.0889 Å; Z=4".
- Fayalite wikiPageUsesTemplate Template:Commons_category.
- Fayalite wikiPageUsesTemplate Template:Infobox_mineral.
- Fayalite wikiPageUsesTemplate Template:Reflist.
- Fayalite subject Category:Iron_minerals.
- Fayalite subject Category:Nesosilicates.
- Fayalite type ChemicalSubstance.
- Fayalite type Mineral.
- Fayalite type Nesosilicate.
- Fayalite type ChemicalObject.
- Fayalite type Thing.
- Fayalite type Q7946.
- Fayalite comment "Fayalite (Fe2SiO4; commonly abbreviated to Fa), also called iron chrysolite, is the iron-rich end-member of the olivine solid-solution series.".
- Fayalite label "Fayalite".
- Fayalite sameAs Faialita.
- Fayalite sameAs Fayalit.