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Deutsches Mindat - ForumThomsonit aus Indien
21st Jul 2012 00:03 UTCNorbert Fuchs
Dekkan-Trapp.Vergesellschaftet ist auf dem Stück laut Etikett Apophyllit mit Thomsonit.
Das müsste für das Fundgebiet eine recht seltene Paragenese sein,wenn die Bestimmung
richtig ist.
Kann jemand sagen,ob diese Paragenese überhaupt im Dekkan-Trapp vorkommt?
1st Sep 2012 23:27 UTCMartin Rich Expert
Diese Paragenese ist eher unwahrscheinlich. Thomsonit ist im Dekkan-Trapp sehr selten und bildet geschlossene, kugelförmige Aggregate mit radialstrahligem Aufbau. Diese Aggregate sind meist ohne Begleitmineralien. Bei den Zeolithen in Begleitung mit Apophyllit handelt es sich meist um ein Mineral der Natrolith-Reihe (Skolezit-Natrolith-Mesolith).
Sehr aufschlussreich ist das Buch "Indien" von Berthold Ottens.
2nd Sep 2012 00:16 UTCNorbert Fuchs
Ich hab jetzt auch ein Bild der besagten Stufe.Von der Ausbildung der Aggregate her,
denke ich nicht,dass es Skolezit/Mesolith ist.
2nd Sep 2012 19:54 UTCUwe Kolitsch Manager
http://www.mindat.org/photosearch.php?frm_id=mls&cform_is_valid=1&minname=okenite&cf_mls_page=1®ion=india&sort=&submit_mls=Search
2nd Sep 2012 20:21 UTCMartin Rich Expert
Okenit ist auch eine Option. Man müsste probieren, ob man mit einer Nadel diese kugeligen Aggregate ritzen kann. Okenit ist elastisch und Thomsonit ist relativ hart und spröde.
2nd Sep 2012 21:36 UTCNorbert Fuchs
Norbert
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