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Websterit
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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Websterite sind relativ seltene Gesteine aus der Gruppe ultramafischer Gesteine. Der Gehalt an Klinopyroxen, Orthopyroxen und Olivin liegt zusammen bei mindestens 90 %, wobei der Anteil von Olivin an den mafischen Mineralen 10 % nicht ΓΌbersteigt. Damit gehΓΆrt das Gestein zur Gruppe der Pyroxenite mit einem VerhΓ€ltnis der Klinopyroxene zu den Orthopyroxenen mit 1:9 bis 9:1. Typische Nebengemengteile sind Granate und Spinelle.cite-ref-1[1] Seinen Namen erhielt das Gestein nach dem Ort Webster in North Carolina.cite-ref-2[2] Websterite treten meist als Kumulate in zonierten ultrabasischen Komplexen mit Peridotiten auf.
Contents
β’ Einzelnachweise
β’ Literatur
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Einzelnachweise
cite-note-11. β A. J. Stoltz: Garnet websterites and associated ultramafic inclusions from a nepheline mugearite in the Walcha area, New South Wales, Australia. Mineralogical Magazine 48, 167β179 (1984).
cite-note-22. β Websterite auf www.worldofstones.com
Literatur
β’ Wolfhard Wimmenauer: Petrographie der magmatischen und metamorphen Gesteine. Enke, Stuttgart 1985, S. 114. ISBN 3-432-94671-6