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"Chrome" / yellow cerussite. Colour causing mechanisms.
  
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Peter Olubas




Joined: 31 May 2016
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PostPosted: Jun 22, 2017 01:31    Post subject: "Chrome" / yellow cerussite. Colour causing mechanisms.  

Greetings All,
I have been interested in what causes the yellow colour of some cerussite specimens for quite a while. Also wondering why some of the yellow cerussites exhibit cyclic crystallization habits.
Looking at some of the more recent published data, they seem to conclude that the Cr levels are too low to give the colouration.
In 1988 I did some undergrad work on this using both AAS and electron spin resonance. Data was all hard-copy so difficult to superimpose ESR spectras of crocoite and yellow cerussite.
Does anyone know if more recent work has combined a number of different techniques to look at this issue.
This is particularly relevant as the key chromophoric mechanisms are caused by electron transfers.
Thanks,
Peter.
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Jordi Fabre
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PostPosted: Jul 14, 2017 10:37    Post subject: Re: "Chrome" / yellow cerussite. Colour causing mechanisms.  

Mirjan Zorz wrote:

Please find below www address leading to the article (Melchiorre et al.) on the role of chromimum to yellow coloring of cerussite. As a matter of fact, its yellow color is not ascribed to chromium but to inclusions of organic matter. As far as the “cog-weel” morphology is concerned that’s a typical habit of cerussite to form cyclic twins. Cerussite twins of this type can be found in many locations around the world.

With best regards,

Mirjan

https://www.researchgate.net/profile/Erik_Melchiorre/publication/283215418_Dispelling_the_myth_of_chrome_cerussite_new_data_on_mechanisms_responsible_for_the_yellow_color/links/562f182d08aef25a24445998/Dispelling-the-myth-of-chrome-cerussite-new-data-on-mechanisms-responsible-for-the-yellow-color.pdf



Thanks Mirjan!
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