File:Iron content in sand Sossusvlei (2018) incl magnification inset.jpg

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English: Examination of the composition of the sand of the Namib desert in the Sossusvlei area by pushing a magnet into the sand and pulling it out again. The dark particles coating the magnet (see inset in the top right corner) probably are chemically unweathered or only slightly weathered grains of basalt which contain the ferromagnetic minerals magnetite (Fe3O4) and maghemite (γ-Fe2O3; originates from the arrested chemical weathering of the magnetite under the highly arid conditions in the Namib desert).[1] The proportion of iron compounds is generally relatively high in the Sand as it is expressed by its reddish colour resulting from the advanced chemical weathering of iron-containing minerals. These reddish iron oxides and hydroxides are, however, not ferromagnetic (anymore) and thus do not stick to the magnet.
Deutsch: Demonstration des Gehaltes des Sandes der Namib der Sossusvlei-Region an ferrimagnetischen Partikeln durch das Hineinstecken und wieder Herausziehen eines Magneten. Bei dem schwarzen Material, das den Magneten überzieht (siehe den vergrößerten Ausschnitt oben rechts) handelt es sich wahrscheinlich um nicht oder nur schwach chemisch verwitterte Basaltkörnchen, die die ferromagnetischen Minerale Magnetit (Fe3O4) und Maghemit (γ-Fe2O3; entsteht aus Magnetit durch gebremste chemische Verwitterung unter den hochariden Bedingungen in der Namib) enthalten.[1] Der Anteil an Eisenverbindungen im Sand ist generell relativ hoch, wie man es an der rötlichen Farbe erkennt, die das Ergebnis fortgeschrittener chemischer Verwitterung eisenhaltiger Minerale ist. Diese rötlichen Eisenoxide und -hydroxide sind jedoch nicht (mehr) ferromagnetisch und bleiben deshalb nicht am Magneten hängen.
  1. ↑ a b cf. A. U. Gehring, H. Fischer, M. Louvel, K. Kunze, P. G. Weidler (2009): High temperature stability of natural maghemite: a magnetic and spectroscopic study. Geophysical Journal International 179(3):1361–1371, doi:10.1111/j.1365-246X.2009.04348.x
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Source Iron content in sand Sossusvlei (2018).jpg
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Camera location24° 07′ 50.98″ S, 15° 52′ 50.38″ E Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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current13:17, 14 August 2018Thumbnail for version as of 13:17, 14 August 20184,746 × 3,305 (6.13 MB)Gretarsson (talk | contribs){{Information |description ={{en|1=Examination of the composition of the sand of the Namib desert at Sossusvlei by pushing a magnet into the sand and pulling it out again. The dark particles coating the magnet (see inset in the top right corner) probably are chemically unweathered or only slightly weathered grains of basalt which contain the ferromagnetic minerals magnetite and maghemite (which originates from the arrested chemical weathering of the magnetite under the hihgly arid condition...

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