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Offline wus47Topic starter
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« on: September 26, 2017, 07:24:00 am »
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Few years ago I found some pyrites. Now certain pyrites have gold color. Why?

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« Reply #1 on: September 26, 2017, 07:57:54 am »
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  Not sure I know what your asking here.  Why pyrites are the color they are ?

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Offline wus47Topic starter
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« Reply #2 on: September 26, 2017, 08:08:49 am »
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Before those pyrites had white(or silver) color. Now gold color, but only some pyrites (2_3pieces).


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« Last Edit: September 26, 2017, 08:50:01 am by wus47 »
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« Reply #3 on: September 26, 2017, 08:11:39 am »
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Are you saying your Pyrites are changing colors ?


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« Reply #4 on: September 26, 2017, 08:52:58 am »
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Yes. I read about bacteries which add gold to pyrites.

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« Reply #5 on: September 26, 2017, 09:38:17 am »
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   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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https://en.wikipedia.org/wiki/Pyrite


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« Reply #6 on: September 26, 2017, 09:13:27 pm »
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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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« Reply #7 on: September 27, 2017, 07:40:53 am »
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   All Pyrites are not the same.  There are many varieties. 

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« Reply #8 on: September 27, 2017, 05:12:54 pm »
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Thank you!  I know this about marcasites and my post is about its.


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