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Allanite-(Ce)

Posted by Rock Currier  
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Knut Eldjarn December 31, 2009 09:56AM
Rock,
additional information on good localities for Allanite-Ce in Norway.
Exceptionally sharp, platy crystals to about 4 cm have been found in miarolitic cavities in syenites in the hills in the northern part of the capital Oslo. One exceptional crystal was found at Grefsenåsen in the mid 19th century (mentioned by Kierulf 1865) and is on display at the Oslo Mineralogical Museum. A picture can be seen her: http://www.kjemi.uio.no/periodesystemet/vis.php?e=Ce&kat=1

Sharp crystals of Allanite-Ce to 2 cm , partly with epidote overgrowths are known from many skarn-localities in the Oslo-region, i.e. from Hörtekollen in Sylling, Lier.
Allanite-Ce is very common in the granite pegmatites of Southern Norway (Telemark, Aust-Agder and Vest-Agder) with rough crystals exceeding 100 kg. Most crystals are prismatic. I have a (self-collected) group of crystals to 60 cm with a diameter of about 10 cm from the pegmatite at Karlstadgangen, Kragerø, Telemark (mentioned also by Spencer).
Allanite is also common in pegmatites of the Tysfjord--area in large massses and rough crystals to about 20 cm. At the Hundholmen locality sharp Allanite-crystals to 3 cm occur embedded in matrix.
Knut



Edited 1 time(s). Last edit at 12/31/2009 10:05AM by Knut Eldjarn.
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Rock Currier December 31, 2009 01:18PM
Knut

Thats good information. Do you know how big that fine crystal from Grefsenåsen is? I was unable to tell from looking at the picture or the text?

Rock Currier
Crystals not pistols.
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James Christopher December 31, 2009 01:57PM
If I can steal a picture from Rudy.... Here is an allanite from a place not far from me, the Burroughs Mine. This locality is on private property and was only mined for a few years. Actually a few of REE pegmatites along the front range of Colorado have allanite. I haven't visited many of them however, so don't know what the crystals are like from those.

Burroughs Mine (Traut-Rudin-Anderson Pegmatite; Sunrise Peak Mine), Clear Creek pegmatite Province, Jefferson Co., Colorado, USA, 16.2cm wide


"A 16.2x2.1x1.5cm; 81.4gm, crystal. Specimen has been reassembled. Allanite at this locality all occurs already fractured in place. the crystals are easily removed from pegmatite wall with fingers. Natural rehealing is visible at fractures as well as alterations on crystal surface. Rudy Bolona collection; collected Sept. 1, 2007."



Edited 4 time(s). Last edit at 01/02/2010 03:15PM by Jim Hall.
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Knut Eldjarn December 31, 2009 04:21PM
Rock,
the crystal from Grefsenåsen is 3 cm wide - as far as my memory goes...
Happy New Year !

Knut
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Rock Currier January 02, 2010 06:14AM
Jim,
That is an interesting crystal. Any chance we could get a better picture of it? If not, perhaps you could run the one you have through photshop, crop and brighten it up a bit?

Rock Currier
Crystals not pistols.
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James Christopher January 02, 2010 02:55PM
I wish it was mine. It belongs to Rudy Boloña, so you need to ask him for a better photo if he still has it. Hopefully you don't mind Rudy, but here you go Rock. Is that more what you are looking for? Just be sure to use the above credit for the photo.
http://66rover.com/RudyAllanite.jpg



Edited 1 time(s). Last edit at 01/02/2010 03:14PM by Jim Hall.
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Rudy Bolona January 02, 2010 06:00PM
Hey Jim,

I don't mind at all. Yes, I still have this crystal. I can't see parting with it, it's just too cool. These occur in a discontinuous zone of white albite. I'll bet if we could work this zone deeper into the pegmatite we might uncover some more of these. I'm sure they will all require repair work though. At present you can see a cast where an even larger crystal was collected at some point. I will see if I can get a better photo of this one.



Edited 1 time(s). Last edit at 01/02/2010 06:02PM by Rudy Bolona.
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James Christopher January 02, 2010 08:10PM
Well, if you want to go there this spring, after things melt off, let me know and i will talk to my friend again to get access.
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Rudy Bolona January 02, 2010 10:38PM
Sounds good.
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Rock Currier January 03, 2010 10:42AM
Jim, Thanks thats better. I changed out the old image in the Mindat gallery for the one that you just posted above.

Rock Currier
Crystals not pistols.
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