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Improving Mindat.orgConnelite from Sardinia
8th Sep 2011 01:55 UTCReiner Mielke Expert
8th Sep 2011 13:32 UTCLefteris Rantos Expert
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
8th Sep 2011 15:17 UTCUwe Kolitsch Manager
8th Sep 2011 15:27 UTCPeter Haas
8th Sep 2011 16:16 UTCLuigi Chiappino Expert
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
14th Sep 2011 13:32 UTCPatrice Queneau Expert
14th Sep 2011 18:32 UTCUwe Kolitsch Manager
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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: April 18, 2024 12:01:47