FUCK YEAH MINERALOGY
A blog dedicated to minerals of all sorts.

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Banded Iron Formation With Tiger’s Eye (by Maitri)
Before oxygen was present in the atmosphere, iron existed as Fe2+, which was soluble in water.  As oxygen levels rose, it was oxidized to Fe3+, became insoluble, and dropped out of the water, forming these alternating layers of iron and chert, known as banded iron formations (BIFs).  They are a major source of magnetite (Fe3O4) and hematite (Fe2O3).
  1. Banded Iron Formation With Tiger’s Eye (by Maitri)

    Before oxygen was present in the atmosphere, iron existed as Fe2+, which was soluble in water.  As oxygen levels rose, it was oxidized to Fe3+, became insoluble, and dropped out of the water, forming these alternating layers of iron and chert, known as banded iron formations (BIFs).  They are a major source of magnetite (Fe3O4) and hematite (Fe2O3).

  1. 54 notesTimestamp: Sunday 2012/12/23 12:01:36Source: Flickr / maitribanded iron formationgeologyhematitemagnetitemineralogymineralschert
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    look and them layers so sexy
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  22. dakotared reblogged this from fuckyeahmineralogy and added:
    Nice bit of BIF :)
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  27. krabiel reblogged this from fuckyeahmineralogy and added:
    BIFs BIFs are the fucking best