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avatar Fluorarrojadite-(NaFe)
May 22, 2012 09:07PM
    
Hello,
what's the actual situation of the Fluorarrojadite-(NaFe)?

I've analysed a specimen (EDS) with this result:
O 27.29
F 6.27
Na 3.16
Mg 0.71
Al 11.21
P 16.42
Ca 25.78
Fe 2.20

The morphology match also.

Cheers,
Pedro Alves
Re: Fluorarrojadite-(NaFe)
May 23, 2012 04:21PM
    
Arrojadite-group minerals must be checked/identified by quantitative chemical analysis and XRD studies (at least).
avatar Re: Fluorarrojadite-(NaFe)
May 23, 2012 07:23PM
    
Uwe,
thanks for your intervention.
I was just curious about the actual situation of some minerals of the arrojadite group. Of course, only by EDS it's not posible to caracterize the species.
Anyway i'm sorry for the stupid and precipitated post. Looking the values, even with semiquantitative analysis, it could never be a member of the arrojadite group (no Fe or Mn enough to M position-13).
By other side, the values fit nicelly with Morinite's chemical composition. Again, we need to confirm with structural analysis.

Sorry again,

Pedro
Re: Fluorarrojadite-(NaFe)
May 24, 2012 08:17AM
    
Hi Pedro, no worries.
avatar Re: Fluorarrojadite-(NaFe)
June 04, 2012 02:44PM
    
Hello again,
it's Morinite!
Confirmed by p-XRD.

Cheers,
Pedro
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