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Improving Mindat.orgConnelite from Sardinia

8th Sep 2011 01:55 UTCReiner Mielke Expert

http://www.mindat.org/photo-191384.html this and other photos posted of this from that locality look a lot like Schmiederite ( http://www.mindat.org/photo-238597.html ) and since Connelite is not a mineral listed as found there, but Schmiederite is, why is this being called Connelite?

8th Sep 2011 13:32 UTCLefteris Rantos Expert

Hi,


I would keep my fingers crossed on this. The array of associated secondary Cu-species at Baccu Locci is a very typical environment one would expect to find Connellite. And I assume there has been much collecting and/or research on the locality recently, given that the list of species (and number of photos on mindat) is growing rapidly. So I definitely wouldn't rule out Connellite, even if it's not listed yet!


Also keep in mind that Schmiederite is a rare species, that occurs in specific Se-rich environments. Although the Baccu-Locci Mine is well known for its secondary Se species, i suspect that these specimens are from a sulfate association, forming directly from the alteration of Cu sulfides (for example, see http://www.mindat.org/photo-283723.html ).


Moreover, all the photos of Connellite from the locality actually look very typical for the species, with sprays of deep electric-blue glassy xls, with tapering needle-like terminations. Schmiederite is typically a lighter sky-blue, with a silky fibrous habit (although some are indeed a brighter blue).


Finally, I suspect that some "Schmiederites" directly associated with sulfates and with a brighter "linarite-blue" color (including some specimens from Baccu Locci), might actually represent an intermediate member in the Linarite-Schmiederite system, possibly the relatively new species Munakataite. These two are examples of what I have in mind: http://www.mindat.org/photo-313233.html http://www.mindat.org/photo-33800.html


Although this is just an assumption not backed by any data, I think it would be worth some further investigation!


Lefteris.

8th Sep 2011 14:12 UTCDomenico Preite Expert

Ciao Reiner and Lefteris for me this foto regarding schmiederite and not connellite, ciao

8th Sep 2011 15:17 UTCUwe Kolitsch Manager

It certainly looks like connellite.

8th Sep 2011 15:27 UTCPeter Haas

In a sulphate-dominant secondary mineral paragenesis formed from copper sulphides, langite is also an abundant species and can show a variety of habits. While none of the photos referred to above really looks like langite, it should be kept in mind as a possibility when trying to identify species in such an association. It is often associated with brochantite, but can also occur with connellite.

8th Sep 2011 16:16 UTCLuigi Chiappino Expert

Dear All

for me this foto regarding schmiederite or linarite and not connellite,

connellite is present to Baccu Locci but is much dark blue

Luigi

8th Sep 2011 16:32 UTCUwe Kolitsch Manager

Message sent.

14th Sep 2011 13:32 UTCPatrice Queneau Expert

Désolé de contredire certains commentaires sur ma photo de connellite mais les cristaux sont de forme hexagonale à fort grossissement même si celà ne se voit pas sur la photo . Par contre je n'ai pas fait d'analyses sur cet échantillon et j'ai acquis celui ci par échange . Je ne changerai donc pas les données sur cette photo à moins d'avoir d'autres suggétions ou de bonne volontés pour faire des analyses . Bien cordialement à tous . P . Queneau

14th Sep 2011 18:32 UTCUwe Kolitsch Manager

Merci Patrice, je vais ajouter votre informations dans la description.
 
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