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Autunite/meta-autunite/autunite group?

Posted by Michael Otto  
Michael Otto May 22, 2012 11:36PM
The Autunite is on a large Smoky Quartz crystal collected in Litchfield county,Ct. I have others from the same pocket that fluoresce bright green at the contact points but Autunite cannot be seen without SW. With this particular crystal it is possible to see the Autunite with the naked eye. Should they be labeled the same or one meta and the other Autunite or all just plain Autunite group?
open | download - IMG_2355.jpg (218.4 KB)
open | download - IMG_2359.jpg (211.1 KB)
Reiner Mielke May 23, 2012 01:42AM
May just be uranyl ions in calcite or opal, green fluorescence does not necessarily mean it is autunite.
Michael Otto May 23, 2012 08:03AM
Reiner Mielke Wrote:
> May just be uranyl ions in calcite or opal, green
> fluorescence does not necessarily mean it is
> autunite.

I should have mentioned Autunite is listed for this locality, Calcite and Opal are not. I should have it's radioactivity checked.
Rob Woodside May 23, 2012 07:10PM
Michael, you say, " but Autunite cannot be seen without SW." In that case you see Uranyl ions as Reiner says and not necessarily autunite.
Don Saathoff May 23, 2012 07:13PM
Also, both calcite & opal, being nearly ubiquitous, are not often mentioned in a species list unless they are significant.

Fred E. Davis May 24, 2012 11:59AM
If you can only see it fluoresce in SW, then it's not autunite. Autunite will fluoresce brightly in LW, and even brighter in SW.
Ronald John Gyllenhammer May 24, 2012 03:36PM
Hi Michael,

This is almost certainly Opal-AN, as Reiner and Don suggested.


Edited 1 time(s). Last edit at 05/24/2012 05:07PM by Ronald John Gyllenhammer.
Michael Otto May 28, 2012 12:36PM
Thanks for the help w/ID. The photo of the same view of the point of the crystal without SW light shows the white material, which fluoresces bright green, and is clearly seen with naked eye. Some of the contact points with other crystals fluoresce brightly, but material cannot be seen without SW.
Donald Peck May 28, 2012 03:56PM
Hi Michael,
Is your quartz crystal from the East Morris Dam quarry pit? A number of large smokey quartz crystals have come from there and there significant uranium minerals in that area. Most of it is carnotite, but I see no reason that others that fluoresce would not be there also.
Harold Moritz (2) June 12, 2012 01:06PM
Definitely opal-AN, which is basically everywhere in Conn. if you look enough with a UV lamp.
Little or nothing has been written about this quarry other than a few lists in guidebooks or club bulletins without supporting data. Even the bedrock quadrangle map done by Gates in 1951 does not show the Nonewaug (aka Woodbury) Granite extending into the hill where the quarry is (which is shown by the topo lines) even though it clearly does (he shows it nearby though). The accompanying text gives only a general description of the petrology and mineralogy of this formation, with no mention of uranium minerals. As far as I know, carnotite in Connecticut is restricted to the sandstones of the Hartford basin, well documented at the Old Newgate Mine in East Granby.
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