[Rockhounds] Help! Has anyone ever seenor heardof blackTorbernite?

[Axel Emmermann]

It would be something else!
I tried to pry al little grain loose from prof. Vochten but he wouldn't part
from it (his specimen consisted of some small fragment in a test-tube...
nothing like a good crystal on matrix.
Torbernite and vochtenite aren't that different apparently... replace Cu
with Fe and Mg and your torbernite specimen is upgraded ;-)))

Cheers

Axel


> -----Oorspronkelijk bericht-----
> Van: rockhounds-bounces at lists.drizzle.com
[mailto:rockhounds-bounces at lists.drizzle.com]
> Namens Kreigh Tomaszewski
> Verzonden: zondag 15 maart 2009 22:44
> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> Onderwerp: Re: [Rockhounds] Help! Has anyone ever seenor heardof
blackTorbernite?
> 
> Axel,
> 
> Well now that you mention it, if I get the lighting just right there
> are three or four 1-3mm crystals in a cluster in the middle of the
> black that look metallic bronzish brown with the light reflecting off
> their faces. Possible Vochtenite is probably an overstatement, but I
> was already thinking of sending the specimen to the lab for analysis of
> the black.
> 
> Kreigh
> 
> 
> 
> On Sunday, Mar 15, 2009, at 14:43 America/Detroit, Axel Emmermann wrote:
> 
> > If you are VERY lucky, you have a specimen of Vochtenite (LOL, just
> > kidding)
> >
> > There are only two specimens of this mineral and Renaud Vochten has
> > lost
> > his. one remaining!
> >
> >
> >
> > Axel
> >
> >> -----Oorspronkelijk bericht-----
> >
> >> Van: rockhounds-bounces at lists.drizzle.com
> > [mailto:rockhounds-bounces at lists.drizzle.com]
> >
> >> Namens Kreigh Tomaszewski
> >
> >> Verzonden: zondag 15 maart 2009 20:02
> >
> >> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem
> >> collectors
> >
> >> Onderwerp: Re: [Rockhounds] Help! Has anyone ever seen or heardof
> > blackTorbernite?
> >
> >>
> >
> >> Thanks Axel! And in interesting website too.
> >
> >>
> >
> >> All the references I had for Metatorbornite just listed it as dark
> >
> >> green, and this is definately black.
> >
> >>
> >
> >> Kreigh
> >
> >>
> >
> >>
> >
> >> On Sunday, Mar 15, 2009, at 05:57 America/Detroit, Axel Emmermann
> >> wrote:
> >
> >>
> >
> >>> Kreigh,
> >
> >>>
> >
> >>> I found a reference that may make sense:
> >
> >>> http://www.uraniumminerals.com/UTh/M-Torbernite.htm
> >
> >>>
> >
> >>> Meta-torbernite is sometimes nearly black and occurs as a pseudomorph
> >
> >>> after
> >
> >>> torbernite. There are several degrees of dehidratation and it appears
> >
> >>> that
> >
> >>> the color (pale green to almost black) is greatly influenced by
> >
> >>> formation
> >
> >>> process.
> >
> >>>
> >
> >>> Axel
> >
> >>>
> >
> >>>
> >
> >>>
> >
> >>>> -----Oorspronkelijk bericht-----
> >
> >>>> Van: rockhounds-bounces at lists.drizzle.com
> >
> >>> [mailto:rockhounds-bounces at lists.drizzle.com]
> >
> >>>> Namens Kreigh Tomaszewski
> >
> >>>> Verzonden: zondag 15 maart 2009 4:39
> >
> >>>> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem
> >
> >>>> collectors
> >
> >>>> Onderwerp: [Rockhounds] Help! Has anyone ever seen or heard of
> >
> >>> blackTorbernite?
> >
> >>>>
> >
> >>>> Hey List,
> >
> >>>>
> >
> >>>> I recently acquired two specimens of Torbernite from Bendada Quarry
> >>>> in
> >
> >>>> Portugal. Both of the specimens are mostly beautifully formed,
> >>>> bright
> >
> >>>> green, torbernite crystals, up to 6 mm, standing on edge, in a
> >
> >>>> beautiful patchwork coating. I have absolutely no doubt about the
> >
> >>>> Torbernite identification for the green crystals.
> >
> >>>>
> >
> >>>> However, both specimens have a portion that is covered with what
> >>>> looks
> >
> >>>> like black torbernite crystals. On both specimens there are a few
> >
> >>>> crystals that are half green and half black.
> >
> >>>>
> >
> >>>> I've never heard of black torbernite. I'm guessing a pseudomorph,
> >>>> but
> >
> >>>> what the heck could it be? Torbernite without the Uranium? What
> >>>> would
> >
> >>>> that be?
> >
> >>>>
> >
> >>>> I did find one Torbernite specimen for sale from the quarry that
> >
> >>>> included Nsutite (which is not listed by Mindat for the locality)
> >>>> as a
> >
> >>>> black secondary mineral, but it doesn't make sense chemically to me.
> >
> >>>>
> >
> >>>> Do any of you experts have a suggestion for what I have acquired in
> >>>> a
> >
> >>>> trade? I want to make a good label, but I'm stumped.
> >
> >>>>
> >
> >>>> Kreigh
> >
> >>>>
> >
> >>>>
> >
> >>>> --
> >
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> >>
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> >>
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