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GeneralUraninite Brazil - searching for exact location
29th Sep 2014 04:36 UTCChristopher O'Neill
These are specimens of uraninite on and within childrenite crystals from Minas Gerais, Brazil.
We are attempting to find a definitive location for these specimens
Is there anyone out there, who is familiar with the MG region, that has seen similar specimens?
Regards,
Chris
29th Sep 2014 10:44 UTCLuís Martins 🌟
I have never seen a sample like this, but the number of localities in Brazil capable of producing Childrenite like that is not large...
29th Sep 2014 15:53 UTCChristopher O'Neill
These are from an old Louis Zara collection. The only confirmation I could make is that they are radioactive and you can see a round alteration hole in the lower right of the top photo. I could send a sample out for EDS to verify but I thought I would at least find another example of this somewhere.
I have been checking images of other specimens to see if something like this was evident but overlooked. I found this one, however there is no way to tell what the black stuff is and I'm now wondering how to tell the difference between childrenite, eosphorite and ernstite
Ernstite ps. after childrenite - Boa Esperança Claim, Linopolis, Divino das Lananjeiras, Minas Gerais, Brazil
The eosphorite in the following link has black inclusions........
http://www.mindat.org/photo-5854.html
29th Sep 2014 18:29 UTCRob Woodside 🌟 Manager
29th Sep 2014 19:13 UTCChristopher O'Neill
If it is a mineral other then uraninite, it seems more like Baddeleyite from the MG region.
30th Sep 2014 18:02 UTCVitya
http://www.mindat.org/gallery.php?loc=387&min=4102
How was the radioactivity also measured or verified. I would recommend to use a good Geiger counter and Uraninite is usually very active on the display from the ones I have seen in Haliburton/Hastings Co. Being radioactive doesn't necessarily indicate it is Uraninite it could be one of the other species listed here:
http://www.mindat.org/loc-387.html
30th Sep 2014 18:31 UTCRob Woodside 🌟 Manager
30th Sep 2014 19:10 UTCChristopher O'Neill
I use a Ludlum Model 3 with a 44-9 probe so its a pretty good counter.
And Rob, I agree that this should be sent out for EDS, I have a number of items ready to send up to Kerry Day, so I will include this as well. It could be very interesting if is NOT uraninite as well.
I was just hoping there were similar specimens out there, like this one.
I'd like to thanks everyone for their feedback,
Chris
30th Sep 2014 23:41 UTCChristopher O'Neill
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: March 28, 2024 09:47:40