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Cleaning Pyrite
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James Catmur
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PostPosted: Jul 21, 2016 03:37    Post subject: Re: Cleaning Pyrite  

Pierre Joubert wrote:
James wrote:
Do not use water, as it causes the matrix to swell and split!


Hi James, that is exactly what Ivan said: ' If the cubes are on matrix, do not use water, just a soft brush.'
I personally do not like the matrix as it is, as I understand it, only a clay. The matrix is also heavy and expensive to post. Does anyone know how these originally formed and how did they end up in the clay?


Sorry Pierre, I was just explaining the reason why one should not use water - the effect is rather annoying if you have a specimen with multiple, separate cubes arranged nicely on the marl matrix. Like the one shown below (which has been no where near water)



img181_915.jpg
 Mineral: Pyrite
 Locality:
Valdeperillo, Cornago, Comarca Arnedo, La Rioja, Spain
 Description:
 Viewed:  8361 Time(s)

img181_915.jpg


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Pierre Joubert




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PostPosted: Jul 21, 2016 04:18    Post subject: Re: Cleaning Pyrite  

Carles Millan wrote:
Pierre Joubert wrote:
Hi James, that is exactly what Ian said: ' If the cubes are on matrix, do not use water, just a soft brush.' I personally do not like the matrix as it is, as I understand it, only a clay. The matrix is also heavy and expensive to post. Does anyone know how these originally formed and how did they end up in the clay?


There are some theories. It was in the Jurassic, about 150 million years ago. There was a large mass of mud formed by clay and gypsum, with some chlorite rich in iron. The temperature and the pressure were rather high, and it was somewhat deep under the surface. By some chemical reactions that I don't know the details, the sulfur from gypsum and the iron from the chlorite reacted to form iron disulfide, pyrite. The crystals grew from inside out making room for themselves in the mud. Eventually the mud dried and was brought to the surface by tectonic movements. The matrix is unstable when wet, so it is much better to prevent it from having contact with water.


Thank you Carles. The result is spectacular. So, the matrix is most probably where they formed and not just a 'vessel'.

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PostPosted: Jul 21, 2016 04:48    Post subject: Re: Cleaning Pyrite  

James wrote:
Pierre Joubert wrote:
James wrote:
Do not use water, as it causes the matrix to swell and split!


Hi James, that is exactly what Ivan said: ' If the cubes are on matrix, do not use water, just a soft brush.'
I personally do not like the matrix as it is, as I understand it, only a clay. The matrix is also heavy and expensive to post. Does anyone know how these originally formed and how did they end up in the clay?


Sorry Pierre, I was just explaining the reason why one should not use water - the effect is rather annoying if you have a specimen with multiple, separate cubes arranged nicely on the marl matrix. Like the one shown below (which has been no where near water)


Hi James. Nice specimen. We swapped a few matrix pieces from Cesar and fully understand this dilemma. I am adding photos of 2 specimens, from Cesar, that has natural oxidation (I do not understand the process).



P1170722.JPG
 Mineral: Pyrite
 Locality:
Ampliación a Victoria Mine, De Alcarama Range, Navajún, Comarca Cervera, La Rioja, Spain
 Dimensions: 47 x 45 x 37 mm
 Description:
 Viewed:  8126 Time(s)

P1170722.JPG



P1170726.JPG
 Mineral: Pyrite
 Locality:
Ampliación a Victoria Mine, De Alcarama Range, Navajún, Comarca Cervera, La Rioja, Spain
 Dimensions: 41 x 33 x 25 mm
 Description:
 Viewed:  8138 Time(s)

P1170726.JPG



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Carles Millan
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PostPosted: Jul 21, 2016 05:07    Post subject: Re: Cleaning Pyrite  

Another example, here with the matrix of marlstone


2780M-pyrite1.jpg
 Mineral: Pyrite
 Locality:
Ampliación a Victoria Mine, De Alcarama Range, Navajún, Comarca Cervera, La Rioja, Spain
 Dimensions: 95 mm x 78 mm. Main crystal: 52 mm wide, 31 mm on edge. Weight: 512 g
 Description:
 Viewed:  8126 Time(s)

2780M-pyrite1.jpg


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