File:BIF (jaspilite meta-BIF, Paleoproterozoic Minas Gerais.jpg

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Hollywood Granite - jaspilite meta-BIF (locally called itabirite) from the Paleoproterozoic-aged Minas Supergroup in the Iron Quadrangle District in Minas Gerais State, Brazil. BIFs in the Iron Quadrangle have long been mined as a source of iron ore. Recently, BIFs there have been quarried as a source of attractive, high-priced, and very-heavy-for-their-size decorative stones.


Banded iron formations, or BIFs, are extinct, marine sedimentary rocks (most have been well metamorphosed) that usually consist of alternating reddish- and silvery-gray iron-rich layers. They are most common in the Paleoproterozoic rock record (2.5 to 1.6 Ga). They represent a time when Earth’s oceans “rusted out” as small amounts of atmospheric free oxygen (O2 gas) combined with dissolved iron in seawater to precipitate as iron oxide minerals. Some workers hypothesize that bacterial mats on the seafloor mediated the precipitation of iron oxides.

Many specific varities of BIFs exist, including jaspilite, taconite, quartzite-specularites, magnetitites, etc.
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Source Hollywood Granite (jaspilite meta-BIF, Paleoproterozoic, Iron Quadrangle District, Minas Gerais State, Brazil)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14627321977. It was reviewed on 3 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

3 August 2014

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current19:31, 3 August 2014Thumbnail for version as of 19:31, 3 August 20142,532 × 2,452 (3.82 MB)Tillman (talk | contribs)Transferred from Flickr via Flickr2commons

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