Definition & Betydelse | Engelska ordet FAYALITE

Definition av FAYALITE

1. (mineraler) fayalit, Fe₂SiO₄

Exempel på hur man kan använda FAYALITE i en mening

• In common with all minerals in the olivine group, fayalite crystallizes in the orthorhombic system (space group Pbnm) with cell parameters a 4.
• Volcanic rocks found at Mount Moulton include pantellerite, phonolite and trachyte; phenocryst phases found in the pantellerite include aenigmatite, anorthoclase, fayalite, hedenbergite, ilmenite and quartz.
• The ignimbrite sheet was formed from rhyolite magma and contains phenocrysts of quartz, sanidine, and subordinate sodic plagioclase, along with minor proportions of magnetite, ilmenite, ferroaugite, fayalite, iron-rich hornblende, zircon, chevkinite, and allanite.
• It also occurs in the Earth's crust, in association with clinopyroxene, plagioclase, ilmenite, cristobalite, tridymite, fayalite, fluorapatite and potassic feldspar, and forms series with pyroxmangite.
• Zanazziite was recently analyzed with an ARL-SEMQ microprobe; the values were Durango apatite for P, Rockport fayalite for Mn, and Kakanui hornblende for all others.
• Other minerals identified were dark green, pyroxene crystals with 70 percent hedenbergite and 30 percent diopside; white aggregates of tridymite; brown, granular olivine crystals with 80 percent forsterite and 20 percent fayalite; and tiny black, hexagonal plates of hematite with beveled edges.
• Its fayalite, ferrosilite place this stone at the extreme higher end of L chondrites, the metal content is typical of LL chondrites and the Co abundance in matrix kamacite (15 mg/g) is at the extreme lower end of LL chondrites.
• Mafic minerals may include aegirine, fayalite, aenigmatite, ilmenite, and sodic amphibole (often arfvedsonite or ferrorichterite).
• Of the silicate minerals, the typical ones are especially cordierite, indialite, fayalite, mullite, tridymite and cristobalite (both tridymite and cristobalite may be classified as oxide minerals, too), and sekaninaite.
• Studies identified the presence of 25 different minerals, including enstatite, ferrosilite, serpentine group, barringerite, diopside, fayalite, ferrosilite, magnetite, pentlandite, pyrrhotite.
• These contain abundant phenocrysts of sanidine and quartz, sparse microphenocrysts of clinopyroxene and orthopyroxene, and extremely rare microphenocrysts of fayalite.
• Rare occurrences of a vitrophyric tuff at the base of the main bed contain ferrohedenbergite and fayalite, while the upper beds sometimes preserve sodic amphibole phenocrysts.
• The Kudaru ring complex was discovered to contain mildly alkaline fayalite granite porphyry, peralkaline arfvedsonite granite and metaluminous biotite granite, emplaced between 176.

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