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Parakuzmenkoite from Russia

Posted by Reiner Mielke  
Reiner Mielke April 13, 2012 02:15AM
I have a sample of Parakuzmenkoite labeled as coming from the Kovdor Massif, has anyone know if this mineral is found there?
Pavel Kartashov April 13, 2012 12:45PM
The specimens photo able to help.
If it is from Kovdor Iron mine - it is rather labuntsovite-Mg, or lemmleinite-Ba, or both them.
Maggie Wilson April 13, 2012 01:57PM
working from home has its advantages... :)

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Pavel Kartashov April 13, 2012 10:24PM
This is really Kovdor specimen with catapleiite and minor anatase. More similar to lemmleinite-Ba.
Reiner Mielke April 14, 2012 12:35AM
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?
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Pavel Kartashov April 14, 2012 01:52AM
Reiner, if EDS in your interpretation is only spectrum without quantitative data, I wouldn't believe it in labuntsovite group minerals identification.
Reiner Mielke May 03, 2012 11:51PM
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 05/04/2012 12:31AM by Reiner Mielke.
open | download - Labuntsovite.jpg (33.2 KB)
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