forsterite oor Viëtnamees
forsterite
en
(mineralogy) A white variety of olivine that is mostly magnesium silicate Mg <sub>2</sub> SiO <sub>4</sub>
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Forsterit
en
olivine, nesosilicate mineral
forsterit
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Forsterite is mainly composed of the anion SiO44− and the cation Mg2+ in a molar ratio 1:2.
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Forsterite-rich olivine is the most abundant mineral in the mantle above a depth of about 400 km (250 mi); pyroxenes are also important minerals in this upper part of the mantle.
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Forsterite, (Mg2SiO4), the magnesium-rich end-member of the olivine solid-solution series.
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Forsterite, fayalite (Fe2SiO4) and tephroite (Mn2SiO4) are the end-members of the olivine solid solution series; other elements such as Ni and Ca substitute for Fe and Mg in olivine, but only in minor proportions in natural occurrences.
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Magnesium-rich olivine (forsterite) favors production of magnesite from peridotite.
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Hence, the crystallizing olivine was Mg-rich, and igneous rocks rich in forsterite were formed.
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MgO and SiO2 concentrations in melts are among the variables that determine whether forsterite olivine or enstatite pyroxene is precipitated, but the water content and pressure are also important.
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Although pure forsterite does not occur in igneous rocks, dunite often contains olivine with forsterite contents at least as Mg-rich as Fo92 (92% forsterite – 8% fayalite); common peridotite contains olivine typically at least as Mg-rich as Fo88.
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Serpentinite reaction 1a and 1b, below, exchange silica between forsterite and fayalite to form serpentine group minerals and magnetite.
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Pure forsterite is composed of magnesium, oxygen and silicon.
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Nearly pure forsterite occurs in some metamorphosed serpentinites.
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This structure of forsterite can form a complete solid solution by replacing the magnesium with iron.
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Serpentine is stable at high pH in the presence of brucite like calcium silicate hydrate, (C-S-H) phases formed along with portlandite (Ca(OH)2) in hardened Portland cement paste after the hydration of belite (Ca2SiO4), the artificial calcium equivalent of forsterite.
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One of the important factors that can increase the portion of forsterite in the olivine solid solution is the ratio of iron(II) ions to iron(III) ions in the magma.
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Modeling of Io's interior composition suggests that the mantle is composed of at least 75% of the magnesium-rich mineral forsterite, and has a bulk composition similar to that of L-chondrite and LL-chondrite meteorites, with higher iron content (compared to silicon) than the Moon or Earth, but lower than Mars.
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The occurrence of forsterite due to the oxidation of iron was observed in the Stromboli volcano in Italy.
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The metamorphism of impure dolomite or other sedimentary rocks with high magnesium and low silica content also produces Mg-rich olivine, or forsterite.
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