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Improving Mindat.orgAlumohydrocalcite or Chalcoalumite
2nd Mar 2009 09:30 UTCPatrice Queneau Expert
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
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
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
2nd Mar 2009 16:37 UTCGeorges Favreau Manager
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
2nd Mar 2009 17:16 UTCPatrice Queneau Expert
2nd Mar 2009 19:40 UTCLeon Hupperichs Expert
Thanks for the comment Georges.
Leon.
18th May 2015 07:25 UTCPierre Monniot
-------------------------------------------------------
> 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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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: March 28, 2024 09:43:57