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Parakuzmenkoite from Russia

Posted by Reiner Mielke  
Parakuzmenkoite from Russia
April 13, 2012 01:15AM
ca    
I have a sample of Parakuzmenkoite labeled as coming from the Kovdor Massif, has anyone know if this mineral is found there?
avatar Re: Parakuzmenkoite from Russia
April 13, 2012 11:45AM
ru    
The specimens photo able to help.
If it is from Kovdor Iron mine - it is rather labuntsovite-Mg, or lemmleinite-Ba, or both them.
avatar Re: Parakuzmenkoite from Russia
April 13, 2012 12:57PM
ca    
working from home has its advantages... :)



avatar Re: Parakuzmenkoite from Russia
April 13, 2012 09:24PM
ru    
This is really Kovdor specimen with catapleiite and minor anatase. More similar to lemmleinite-Ba.
Re: Parakuzmenkoite from Russia
April 13, 2012 11:35PM
ca    
Here are some closeups. There are small blue anatase xls and what looks like blades of catapleiite as well as the orange mineral in question. Also present are crystals of pyrite, some sort of mica, albite? quartz, and some other mineral that looks like a carbonate.
I was told that EDS was done on it and that Parakuzmenkoite was the best match? Unfortunately I don't have a copy of the results and they are not available. Is it possible to distinguish the labuntsovite species by EDS? From what I can see from the published formulas they should be but then maybe in reality they are not compositionally that well defined? It would seem that Parakuzmenkoite is distinctive in that it has Fe and no Na whereas lemmleinite-Ba does?
avatar Re: Parakuzmenkoite from Russia
April 14, 2012 12:52AM
ru    
Reiner, if EDS in your interpretation is only spectrum without quantitative data, I wouldn't believe it in labuntsovite group minerals identification.
Re: Parakuzmenkoite from Russia
May 03, 2012 10:51PM
ca    
Hello Pavel,

Here is the qualitative EDS pattern for the sample. The thin vertical white lines mark where Ba should be, any thoughts on what it is based on this? Except for the color, Lemmleinite-K would seem to be a good fit.



Edited 2 time(s). Last edit at 05/03/2012 11:31PM by Reiner Mielke.
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