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PhotosUranospinite - Mas d'Alary, Lodève, Hérault, Languedoc-Roussillon, France

23rd Nov 2011 19:57 UTCUwe Kolitsch Manager

08042390016020388617842.jpg
Metanováčekite
Mas d'Alary opencast mine, Lodève, Lodève, Hérault, Occitanie, France
Copyright © Stephan Wolfsried 2006
An EDS analysis of such crystals was carried out since the morphology contradicted the tetragonal symmetry reported for uranospinite. The analyses gave only U, As>>P (& possibly Mg, due to overlap with As), but no trace of Ca.

Thus, the mineral is not uranospinite (Ca-uranyl-phosphate).

A PXRD analysis is planned (SXRD study was unsuccessful due to very bad diffraction quality of single crystals, possibly due to a dehydrated state).


Very similar specimens are:

http://www.mindat.org/photo-153194.html

http://www.mindat.org/photo-142959.html

http://www.mindat.org/photo-192137.html

http://www.mindat.org/photo-192136.html


(Messages sent.)

22nd Apr 2016 16:29 UTCUwe Kolitsch Manager

PXRD of Stephan's sample now finally done: it's metanovacáčekite.

The powder pattern is identical to that of a well-studied (EDS, SXRD) metanovacáčekite from the Clara mine.

Will change all photos accordingly.

23rd Apr 2016 09:18 UTCJean-Marc Johannet Manager

Uwe,

Thanks for updating.

BTW, how could we explain the EDS result with "P >> As"?

23rd Apr 2016 19:39 UTCUwe Kolitsch Manager

Sorry, misprint! - Now fixed.

8th Feb 2021 11:17 UTCUwe Kolitsch Manager

Complaint was sent already in 2013. Now changed back to user-only.
 
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