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PhotosZircophyllite - Água de Pau volcano, San Miguel Island, Azores District, Portugal
12th Apr 2012 01:55 UTCModris Baum 🌟 Expert
It's a POTD but it doesn't show up in the zircophyllite gallery, nor in the locality gallery
12th Apr 2012 03:01 UTCAlfredo Petrov Manager
12th Apr 2012 13:27 UTCPedro Alves Expert
and (Ti+Zr) ?
A Ti rich zircophyllite...
Cheers,
Pedro
12th Apr 2012 14:28 UTCMarco E. Ciriotti Manager
analysis (by Roma University) are current...
Ciao. Marco
12th Apr 2012 20:36 UTCPedro Alves Expert
grazie per le informazzioni.
Saluti,
Pedro
12th Apr 2012 22:16 UTCPavel Kartashov Manager
-------------------------------------------------------
> Hi,
> and (Ti+Zr) ?
> A Ti rich zircophyllite...
Rather it is Zr-bearing astrophyllite.;-)
12th Apr 2012 23:38 UTCPedro Alves Expert
your hypothesis seems to be more correct.
Since, in this particular case, we cannot see the F and the Fe content seems to be higher than the Mn one (not sure about that, and not sure also it this may be important).
Cheers,
Pedro
13th Apr 2012 00:07 UTCPavel Kartashov Manager
what about F content, I am think all is OK with it in this mineral. F contents in such rocks are usually enough high.
13th Apr 2012 00:22 UTCPedro Alves Expert
First the Mn content, wich is probably more conclusive. The Zr is not the 'big problem'.
Right?
24th Apr 2012 12:57 UTCLuigi Chiappino Expert
I really appreciate this stimulating discussion, however, I feel the need to remind to you (as it
has been explained to me) that from qualitative EDS analysis it is not, and I repeat, it is not
possible to estimate accurately the relative abundances of the elements. Consequently,
every assignment must be considerd a mere and often a meaningless, speculation.
On the contrary, the attribution was based also on preliminary x-ray diffraction data, that are
probably a better method of identification than the "eye" of an experienced amateur or even a
professor in mineralogy.
Finally, I may be wrong, but there are many groups of minerals (e.g. H, B, Be,
REE and Li bearing minerals), in which also routinary structural and quantitative chemical
analyses, can not be far from sufficient to properly define a species.
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