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Improving Mindat.orgAlumohydrocalcite or Chalcoalumite

2nd Mar 2009 09:30 UTCPatrice Queneau Expert

Hello ! Excuses my english ... I'm not sure of this photos : http://www.mindat.org/photo-92158.html and

http://www.mindat.org/photo-211398.html . Is it possible Chalcoalumite ?

Here my personal collection of this Mineral to Valcroze ( FRANCE ) ( attach file )

Thank you for your help .

2nd Mar 2009 13:21 UTCFrank de Wit Manager

Good question... I cannot answer it (without analyses)

but I think the same question applies to material from the Grand View mine

perhaps someone, with more knowledge than me, could check Chalcoalumites in general? http://www.mindat.org/gallery.php?min=961

Cheers!

2nd Mar 2009 13:57 UTCIan Merkel

Hello Patrice,


I agree with Frank that analyses would be best, but I have never seen chalcoalumite that resembles the material in the mindat photos or your photos, although, the only chalcoalumite I am familiar with is the material from the oxidized SW U.S. porphyries. They all do generally look consistant in form, color and luster.


regards,

Ian Merkel

2nd Mar 2009 16:35 UTCPatrice Queneau Expert

Thank you for your answers. To explain my doubts, I thought that Alumohydrocalcite was more in a volcanic context glue together Eifel, for instance; and, Valcroze is rather a gite portrays seam of copper with Cyanotrichite, Azurite, Malachite etc

2nd Mar 2009 16:37 UTCGeorges Favreau Manager

Hello Patrice,


I have had several specimens analyzed from the Valcroze mine years ago (P.J. Chiappero and H. Sarp), as I used to go quite a lot to this mine.


My analyzed specimens were totally white or blue, with very distinct colors. The white material showed to be alumohydrocalcite, and the blue chalcoalumite. The problem is that there are "both white and blue", "very pale blue" specimens; sometimes the color varies from one crystal ball to another, sometimes the color varies from the surface to the inside of the crusts. I agree this is very complex and I am not even sure that the color clue is sufficient to tell both species apart.


In addition to that, there are also brochantite specimens in very pale green (almost white) platy xls (analyzed, too). I can show you the analyzed specimens when we meet. If I can, I will make pictures for mindat users to see.


Georges.

2nd Mar 2009 17:12 UTCPatrice Queneau Expert

Bonjour Georges et Merci pour tes réponses ; tu peux aussi m'écrire en français si tu veux .... je blague !! Bref puis je alors mettre des photos sur Mindat avec la mention " a mix of Alumohydrocalcite and Chalcoalumite " ? de plus j'ai mis des photos de la Plumbojarosite ; la seule référence que j'ai sur sa présence à Valcroze , c'est un échantillon que j'ai vu à l'école des mines de Paris il y a plus de 20 ans ... As tu d'autres précisions ou des références bibliographiques ? j'ai aussi trouvé de la chalcophyllite ? à ,confirmer et de la langite ; Vas voir la liste de mindat , et as tu d'autres mineraux non signalés dans la liste ? merci à bientôt

2nd Mar 2009 17:16 UTCPatrice Queneau Expert

Ah , j'oubliais : Georges , j'ai aussi des échantillons ressemblant à de la Cyanotrichite mais aussi à de l'Azurite en aiguilles ... voir fichier joint ( là , plutôt cyanotrichite à mon avis ); qu'en penses tu ? et peut être as tu trouvé les mêmes choses ?

2nd Mar 2009 19:40 UTCLeon Hupperichs Expert

Updated the comments to my photo.

Thanks for the comment Georges.


Leon.

18th May 2015 07:25 UTCPierre Monniot

Patrice Queneau Wrote:

-------------------------------------------------------

> Bonjour Georges et Merci pour tes réponses ; tu

> peux aussi m'écrire en français si tu veux ....

> je blague !! Bref puis je alors mettre des photos

> sur Mindat avec la mention " a mix of

> Alumohydrocalcite and Chalcoalumite " ? de plus

> j'ai mis des photos de la Plumbojarosite ; la

> seule référence que j'ai sur sa présence à

> Valcroze , c'est un échantillon que j'ai vu à

> l'école des mines de Paris il y a plus de 20 ans

> ... As tu d'autres précisions ou des références

> bibliographiques ? j'ai aussi trouvé de la

> chalcophyllite ? à ,confirmer et de la langite ;

> Vas voir la liste de mindat , et as tu d'autres

> mineraux non signalés dans la liste ? merci à

> bientôt
 
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