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BDG - Berufsverband Deutscher Geowissenschaftler e.V. Mittelstraße 2-10 53175 Bonn, Germany http://www.geoberuf.de
Contact Ms Tamara Fahry-Seelig +49 33209 21246

Ein Fall für Sherlock Holmes - Der Gneis als Gestein des Jahrs 2015

(PresseBox) (Bonn, )
Ja, es wäre ein Fall für Sherlock Holmes zu ergründen, welchen Ursprungs der jeweilige Gneis ist, den er vor sich liegen hat. - Allerdings würde er sich die Zähne daran ausbeißen und müsste diese Aufgabe den Fachleuten, also den Geologen und Mineralogen, überlassen!

Den Gneis erkennt man an seiner auffälligen Streifung aus Schichten von häufig dunklen plättchenförmigen Glimmermineralen, die sich mit hellen Lagen von Feldspäten und glasigen Quarzkristallen abwechseln. Diese Streifung kann geradlinig parallel oder auch wellig-gefaltet verlaufen. Eine derartige Parallelausrichtung entsteht,wenn sich Kristalle unter Druck senkrecht zur Druckrichtung ausrichten und weiterwachsen.

Neben den genannten Mineralen können auch Granate, Amphibole
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The publisher indicated in each case (see company info by clicking on image/title or company info in the right-hand column) is solely responsible for the stories above, the event or job offer shown and for the image and audio material displayed. As a rule, the publisher is also the author of the texts and the attached image, audio and information material. The use of information published here is generally free of charge for personal information and editorial processing. Please clarify any copyright issues with the stated publisher before further use. In case of publication, please send a specimen copy to service@pressebox.de.