File:Carnotite on dinosaur bone (possibly from the Morrison Formation, Upper Jurassic; Colorado, USA) (14926263573).jpg

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Dinosaur bone partially permineralized with the yellowish, radioactive mineral carnotite (K2(UO2)2(VO4)2·3H2O - hydrous potassium uranyl vanadate) (public display, Colorado School of Mines Geology Museum, Golden, Colorado, USA).

Provenance: possibly derived from the Morrison Formation (Upper Jurassic) of Colorado, USA.

Permineralization is the technical term for the fossilization style seen in “petrified wood”. “Petrified” is a horrible term to a paleontologist. Biogenic materials such as wood or bone have a fair amount of small-scale porosity. After burial, the porosity of wood or bone can get partially or completely filled up with minerals as groundwater or diagenetic fluids percolate through. The end result is a harder, denser material that retains the original three-dimensionality (or close to it). The wood or bone has become “petrified”. Well, no - it’s become permineralized. Not surprisingly, the most common permineralization mineral is quartz (SiO2). Sometimes, fossil wood and bone have been permineralized with radioactive minerals such as black uraninite (UO2) or yellowish carnotite (K2(UO2)2(VO4)2·3H2O). Recently, fossil bones permineralized with cinnabar have been identified (García-Alix et al., 2013, Lethaia 46: 1-6).
Date
Source Carnotite on dinosaur bone (possibly from the Morrison Formation, Upper Jurassic; Colorado, USA)
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14926263573. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

6 May 2015

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