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Paulkerrite?

Posted by Pedro Alves  
avatar Paulkerrite?
November 28, 2011 08:49PM
    
Hi,
are you sure about the paulkerrite? is the sample analysed?
[www.mindat.org]
Sorry, but i have my doubts.
Im my opinion, the most probable is to be phosphosiderite.


Cheers,
Pedro Alves



Edited 1 time(s). Last edit at 11/28/2011 09:37PM by Pedro Alves.
avatar Re: Paulkerrite?
November 28, 2011 08:54PM
    
which photo ?
avatar Re: Paulkerrite?
November 29, 2011 10:47AM
Most probably you are right, Pedro.
Ciao.
Re: Paulkerrite?
November 29, 2011 12:04PM
    
The photo is so bad that how can you know?
avatar Re: Paulkerrite?
November 29, 2011 12:57PM
    
Reiner,
the photo is useless. My proposal is based on typical association (benyacarite + phosphosiderite) and, described by the photo's author, an usual phosphosiderite habit.

Sorry but, for me, the paulkerrite (at Folgosinho) is not proved yet...

Cheers,
Pedro Alves



Edited 1 time(s). Last edit at 11/29/2011 02:04PM by Pedro Alves.
avatar Re: Paulkerrite?
November 29, 2011 04:28PM
    
Is this article in error?

Schnorrer, G. & Tetzer, G. (2005): Paulkerrite, K(Mg,Mn)2Fe2Ti[(OH)3|(PO4)4]×15H2O from Folgosinho quarry in Portugal, an additional locality for this rare compound. Aufschluss 56, 258-260. (in German).

Best Wishes, Van King
avatar Re: Paulkerrite?
November 29, 2011 05:49PM
    
Dear van,
i have a great respect to the authors, but in the article above i can't find any reference to the techniques used to identify the species or results.
In this case, can we assume that as a credible reference?

Cheers,
Pedro Alves



Edited 1 time(s). Last edit at 11/29/2011 05:49PM by Pedro Alves.
avatar Re: Paulkerrite?
November 29, 2011 07:27PM
    
Are you saying you think all paulkerrite is benyacarite, Pedro?

I agree on the picture btw.

Greetings from France,

Eddy
avatar Re: Paulkerrite?
November 29, 2011 08:24PM
    
dear Pedro,

Glad to know that the identification appears to be a guess rather than supported by data. perhaps it was merely x-rayed?

Best Wishes, Van King
Re: Paulkerrite?
November 29, 2011 08:35PM
    
Message sent.

"... but in the article above i can't find any reference to the techniques used to identify the species or results."

Schnorrer usually analysed minerals by SEM-EDS and PXRD.
I will check the article.
avatar Re: Paulkerrite?
November 29, 2011 08:52PM
    
BTW The formula given at Mindat seems to be 2 positive charges away from being balanced, unless they meant H3O.

Best Wishes, Van King
avatar Re: Paulkerrite?
November 29, 2011 09:36PM
    
Eddy,
«Are you saying you think all paulkerrite is benyacarite, Pedro? » No, that is something i can't assure. But, in my experience, all the probable 'paulkerrite' analysed turned out to be Benyacarite.

Cheers,
pedro Alves



Edited 2 time(s). Last edit at 12/21/2011 12:33AM by Pedro Alves.
avatar Re: Paulkerrite?
November 30, 2011 08:03AM
Pedro, I am working on some specimens from Folgoshino (of Chiappino) searching possible paulkerrite crystals...
I will inform about the results.
Ciao.
avatar Re: Paulkerrite?
November 30, 2011 10:43AM
    
Ciao Marco,
many thanks in advance.
I'm working on an article about Folgosinho, that will be helpfull (for all).

Ciao,
Pedro
avatar Re: Paulkerrite?
November 30, 2011 08:29PM
OK Pedro,
I will pass the results as soon as they will be closed.
Ciao. Marco
avatar Re: Paulkerrite?
November 30, 2011 09:09PM
    
Please keep me posted guys.
And if you need more specimens, I have plenty.

Greetings from France,

Eddy
avatar Re: Paulkerrite?
November 30, 2011 10:34PM
Eddy,
please can you send to me just one small specimen?
My address is:
Marco Ciriotti
via San Pietro, 55
I-10073 Devesi-Ciriè (Italy)

I will analize (EDX + SC-XRD, if necessary).
Thank you very very much.
Cheers. Marco
avatar Re: Paulkerrite?
December 01, 2011 09:34PM
    
Will do Marco.
Will ship on monday morning.

Greetings from France,

Eddy
Re: Paulkerrite?
December 02, 2011 09:05AM
    
I checked the Schnorrer & Tetzer (2005) article.
Roughly translated it says "X-ray and chemical studies led to the identification of ... paulkerrite". No details are given, however, on either techniques used or results of the chemical analyses (such as approximate formula, impurity elements, homogeneity, ...).
The article notes that the xls are colour-zoned (pale and dark yellow) and states "presently ... it is unclear if one of the zones corresponds to benyacarite or not".

So there are clearly some open questions.
avatar Re: Paulkerrite?
December 02, 2011 09:45AM
Thank Eddy and thank you Uwe.
I will inform about the quantitative INCA SEM-EDX results of the Eddy specimen etc.
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