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Foide
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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Foide (Feldspatoide, Feldspatvertreter) sind Minerale, die in magmatischem Gestein bei KieselsΓ€uremangel vorkommen, das heiΓt, SiO2-untersΓ€ttigt sind.
Foide kommen in alkalireichen silikatischen Schmelzen und in felsischen Magmatiten vor, wenn der KieselsΓ€uregehalt nicht mehr ausreicht, um mit Aluminium sowie den Alkalimetallen Natrium oder Kalium kieselsΓ€urereiche Feldspate zu bilden.
Foide kΓΆnnen nicht zusammen mit Quarz in einem Gestein vorkommen, da sich bis zum kompletten Aufbrauchen des Siliciumdioxids Feldspate bilden wΓΌrden.
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β’ Weblinks
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Minerale der Foidgruppe
β’ Leucit KAlSi2O6
β’ Nephelin (Na,K)AlSiO4
β’ Sodalith Na8Al6Si6O24Cl2
β’ Nosean Na8Al6Si6O24(SO4)
β’ HaΓΌyn Na3Ca(Si3Al3)O12(SO4)
β’ Cancrinit Na6Ca2Al6Si6O24(CO3)2
β’ Analcim NaAlSi2O6Β·H2O
Weblinks