Gold in pyrites

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wus47:
Few years ago I found some pyrites. Now certain pyrites have gold color. Why?

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wus47

Homefire:
  Not sure I know what your asking here.  Why pyrites are the color they are ?

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wus47:
Before those pyrites had white(or silver) color. Now gold color, but only some pyrites (2_3pieces).


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Homefire:
Are you saying your Pyrites are changing colors ?


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wus47:
Yes. I read about bacteries which add gold to pyrites.

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Homefire:
   Your Pyrites are changing color following Oxidation.  Pyrites are a Sulfided form of some type of metal mineral.  Iron being the primary Mineral.

Some Pyrite deposits do in fact hold a quantity of Gold.

Yes there are some Bacteria associated with Gold.  No they do not Make Gold.  They do how ever deposit Gold as a Product by product of what ever they are consuming.

It would take Billions on Billion of those bacteria to produce some noticeable production.  If your samples are showing more Gold due to Bacterial Actions the Gold was already within the sample.  The Bacteria has only made the Gold Visible.  I do not think that is the case.

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wus47:
Thank you! But other pyrites have dark color as result of oxydation proces. Only one from this pyrites have gold color. At next time I send pictures the mentioned pyrites.

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Homefire:
   All Pyrites are not the same.  There are many varieties.  You are not allowed to view links.
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wus47:
Thank you!  I know this about marcasites and my post is about its.


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