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Pedro Alves May 22, 2012 10:07PM
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.

Pedro Alves
Uwe Kolitsch May 23, 2012 05:21PM
Arrojadite-group minerals must be checked/identified by quantitative chemical analysis and XRD studies (at least).
Pedro Alves May 23, 2012 08:23PM
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,

Uwe Kolitsch May 24, 2012 09:17AM
Hi Pedro, no worries.
Pedro Alves June 04, 2012 03:44PM
Hello again,
it's Morinite!
Confirmed by p-XRD.

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