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Gadolinite-(Ce) & (Y)

Posted by Olav Revheim  
Re: Gadolinite
August 27, 2009 12:23PM




Years ago I had some discussions with Pavel Kartashov about the light green transparent Gadolinites-Y from Furkabasistunnel, Switzerland.
He suggested this being Hingganite. Now one of the ex Alex Kipfer Gadolinites (Alex Kipfer was a wellknown Swiss collector and author)
is shown here as a Gadolinite-Y. The similar habit and colour comes from Abichlalm, Austria. Also titled as Gadolinite-Y.
All alpine minerals in this colour and habit so far are described as Gadolinite-Y. Has this to be revised?

Stephan
avatar Re: Gadolinite
August 27, 2009 01:57PM
Concerning Barringer Hill, I recall that there were picture published in some of the old papers, cannot remember exactly but have set my brain on "search mode".
Concerning White Cloud pegmatite is anyone aware of crystals from there?

johan
avatar Re: Gadolinite
August 27, 2009 02:11PM
us    
White Cloud - xls Gadolinite Y to 2cm long and 0.7cm wide
South Platte District Crystals to 2 inches in length
Clora May pegmatite - crude xl gadolinite y 7x3x2.5 inches (7.5 pounds)
Roscoe pegmatite - well developed monoclinic xls - largest partial xl 11cm in diameter
From "Minerals of Colorado".
avatar Re: Gadolinite
August 28, 2009 11:01AM
Hi again
I found the old pictures from Baringer Hill online: [images.google.se]

hope the link works. They were probably published in one of Frank Hess' papers. If anyone has them on fpdf or if they are online somewhere - please inform

cheers
Re: Gadolinite
August 30, 2009 06:28PM
at    
I doubt that any of the usual Alpine gadolinites have been quantitatively analysed (including Be and B!) - not aware of any reliable studies.
avatar Re: Gadolinite
August 30, 2009 11:13PM
ru    
I haven't such material. But it is obvious for me that this Alpine mineral is Fe-deficient.
avatar Re: Gadolinite
August 31, 2009 06:55AM
Demartin et al. 1993 (Can. Min. vol. 31, pp. 127-136) has the material you're talking about. Abstract pretty much verify your (Uwe and Pavel) statements:
Gadolinite-(Y) specimens from various localities in the Alps have been examined by electron microprobe and single crystal X-ray diffraction. In general, dysprosium is the most abundant rare earth, although a few samples contain approximately equal amounts of Dy and Yb, and in one instance, Gd predominates. In contrast to many non-Alpine occurrences, most of these specimens show only limited amounts of the lighter REE. There is an almost constant presence of calcium (up to 4 wt% CaO, and possibly twice that amount for more questionable samples); iron is often markedly deficient with respect to the theoretical formula, and in at least one case (Glogstafelberg), the material should more properly be called hingganite-(Y) (4.0 wt% FeO). In some specimens, a significant substitution of B for Be (up to about 4.2 wt% B2O3) can be deduced from crystal-structure data, on the basis of linear interpolation of the measured Be-O bond lengths with respect to other gadolinite-group minerals. This substitution is more extensive for specimens high in Ca and low in Fe, and which therefore grade toward darolite. No evidence for replacement of Si by B has been found. Minor amounts of thorium (up to 0.4 wt% ThO2) commonly are present, and uranium (0.3 wt% UO2) was found in one specimen. As for xeootime and monazite, the behavior of Y is not uniquely determined by the ionic radius, some specimens being especially enriched in this element with respect to the middle-heavy rare earths (up to 41.5 wt% Y2O3).

cheers
Re: Gadolinite
September 02, 2009 09:05PM
at    
Added to the gadol.-(Y) page.
Re: Gadolinite
September 08, 2009 08:35AM
no    
I have updated the introduction to this article, and also the description of the Hidra locations. I will continue with the Swedish and US locations.

Ecole du Mines lists an Barringer Hill gadolinite in their collection, catalogue # 2072, size 17x12x9cm, condition excellent. Anyone that has, or can get a picture of this specimen??

Olav
Re: Gadolinite
October 11, 2009 08:56PM
no    
Hi all,

I have completed the first draft of the gadolinite article.
I'd like to thank all contributors not only for all the direct information and papers sent in my direction, but also for trusting me to use this information wisely ::o

A total of 14 locations are included in the article, and 4 of those stands out compared to the rest ( Barringer Hill, Ytterby, Hidra & Evje/Iveland). I have omitted several Colorado, Swedish and Norwegian locations where multiple cm sized crystals has been found. these has been omitted as locations nearby with a similar geology have produced larger, sharper and less altered crystals. These locations have nevertheless produced larger crystals than some of the locations included, as I have split the locations into two clearly separated categoreies: Micro and macro, trying to present the best of both the large and the small. I have further included both gadolinite-Y and gadolinite-Ce as two separate species inside the same article. All comments on my priorities are highly welcome, as is any further information on the locations included or those that should have been included.

smileys with beer

Olav
avatar Re: Gadolinite
October 11, 2009 11:21PM
Olav, A job well done. I may at some point go in and clean up a little of the formatting. Spacing before, between and after images and prehaps tweak the image size on some of the images so they are more uniform. Harjo of the master of that art. You need to put the species name in the caption of each image to conform to the formatting of the other articles.

Rock Currier
Crystals not pistols.
Re: Gadolinite-(Ce) & (Y)
March 21, 2014 04:56PM
no    
A little correction to the history of Gadolinite, as presented above.smiling smiley

Arrhenius found the mineral, which he presented to his friend, Bengt Reinhold Geijer (Bergmester, Stockholm). It was the later, not Arrhenius, who first published the first description of it. He describes it's apperance ( looks like asphalt or coal) etc as well as proposed that it may be an ore of wolfram. He also thought it to be a black zeolite (due to its reaction by a blowpipe analysis).
see Geijer (1788), Crells Annalen I, p. 229-230 : [books.google.no]
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