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Buttgenbachite, Likasi, RD.Congo
  
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Roger Warin




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PostPosted: Jan 29, 2013 14:46    Post subject: Buttgenbachite, Likasi, RD.Congo  

Another very rare mineral, even emblematic, the buttgenbachite from Katanga.
It appears on cuprite, and is sometimes accompanied by silver.
Roger.



But2627ter_R.jpg
 Description:
Buttgenbachite
Mine Panda, Likasi, Katanga, Democratic Republic of Congo.
xls about 15 mm
within massive cuprite
 Viewed:  17613 Time(s)

But2627ter_R.jpg


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gemlover




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PostPosted: Jan 29, 2013 16:18    Post subject: Re: Buttgenbachite, Likasi, RD.Congo  

so fantastic, beautiful specimen. thanks for sharing

john

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John Medici




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PostPosted: Jan 30, 2013 11:50    Post subject: Re: Buttgenbachite, Likasi, RD.Congo  

Roger, great contrasting group of Cu minerals!
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Peter




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PostPosted: Feb 18, 2013 18:44    Post subject: Re: Buttgenbachite, Likasi, RD.Congo  

Wonderful beauty and rarity captured!
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Roger Warin




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PostPosted: Feb 19, 2013 02:12    Post subject: Re: Buttgenbachite, Likasi, RD.Congo  

Many thanks, Peter.
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Pierre Joubert




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PostPosted: Feb 19, 2013 02:25    Post subject: Re: Buttgenbachite, Likasi, RD.Congo  

That, Roger, is a STUNNER!!!
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valere




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PostPosted: Mar 06, 2013 10:02    Post subject: Re: Buttgenbachite, Likasi, RD.Congo  

Buttgenbachite is the holy grail for the Congolese mineral collectors
The only specimen I have is the one used and illustrated in the RRUFF database (RRUFF ID: R090013)

https://rruff.info/

That website is a real mine of data, and its buttgenbachite link gives access to the full text of several publications by simple clicks!
Examples with nice needles big enough to be seen with naked eyes are currently out of reach for young collectors, the quest of new samples of new specimens of Buttgenbackite (and related spieces) will be the ultimate goal of my coming Congolese trips! My hopes are intact!

All the best

Val
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domenico




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PostPosted: Apr 03, 2013 02:36    Post subject: Re: Buttgenbachite, Likasi, RD.Congo  

WAW Roger nice photo and sample !!
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Mark Ost




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PostPosted: Apr 03, 2013 19:24    Post subject: Re: Buttgenbachite, Likasi, RD.Congo  

So delicate. Thanks for sharing.
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Roger Warin




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PostPosted: Apr 04, 2013 01:34    Post subject: Re: Buttgenbachite, Likasi, RD.Congo  

Hello,
About buttgenbachite…
All nitrates are soluble in water. This is because of their extreme rarity. However buttgenbachite exists. It can be found only in extreme drought.
Located on the plateau of Haut-Katanga, Likasi (formerly Jadotville) has a mild tropical climate.
In Likasi (DRC), buttgenbachite is found breaking blocks of massive cuprite.
Its origin may lie in aqueous salt solutions of copper. It will crystallize because many hydroxyl anions are introduced into the crystal. Nitrates groups are structurally almost identical to the carbonate anions. Water molecules of crystallization are introduced into the crystal lattice during the growth. But I never try washing this mineral with water...
Buttgenbachite formula is Cu19Cl4 (NO3)2 (OH)32 • 2 (H2O).
The specimen in my photo is exceptional because the needles form a nice spray. Most of the time, it was tangled packets of needles.
Sometimes, silver is found as paragenesis.
Association: Cuprite, likasite, gerhardtite, malachite, brochantite, silver.
Honors Professor Francois Jean Henri Buttgenbach (1874-1964), Belgian mineralogist, University of Li ege, Belgium, who long studied Congo minerals.
Roger.
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