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Brannerite

Posted by Rock Currier  
avatar Brannerite
June 12, 2009 09:49AM
This article has been prepared for the Mindat Best Minerals project. The aim of this project is to present information on important localities and specimens for each mineral specie. As new finds are made and new knowledge is made available the individual articles will be revised to include this information. Readers are encouraged to contribute by posting a response in this thread. All revisions will be stored, thus ensuring traceability and availability of previously included information. A complete list of articles can be found in the list of finished Best Minerals articles. To cite this version: Currier, R. (2009): Brannerite. revision 1.0. Mindat Best Minerals Project, article "mesg-67-141266". Please be advised that the photos cannot be used without the consent of the copyright holder



Brannerite

(U4+,Ca)(Ti,Fe3+)2O6

Monoclinic




Brannerite, Dieresis Mine, El Cabril, Sierra Albarrana, Córdoba, Andalusia, Spain 6.1cm tall
Brannerite, Dieresis Mine, El Cabril, Sierra Albarrana, Córdoba, Andalusia, Spain 6.1cm tall
Brannerite, Dieresis Mine, El Cabril, Sierra Albarrana, Córdoba, Andalusia, Spain 6.1cm tall

The Handbook of Mineralogy says indistinct prismatic crystals up to 30 cm exist, but do not specify the locality. Also as indistinct prismatic crystals, some showing an orthogonal prism zone; more typically as rounded, detrital grains and pebbles and as irregular embedded grains and masses. Found as a primary mineral in granite pegmatite and in granitic gneiss: in silicified pebble conglomerates; in hydrothermal quartz and calcite veins.1 The type material was taken from a gold placcer near the head of Kelly Gulch in western Custer County, Idaho as detrital crystals and grains.2
1. Handbook of Mineralogy, Anthony, Bideaux, Bladh, Nichols Vol.III, p.76
2. Palache, C., H. Berman, and C. Frondel (1944) Dana's system of mineralogy, 7th edition), v. I, 774-775.


Brannerite,
Austria,
Salzburg, Hohe Tauern Mts, Gastein valley, Böckstein, Naßfeld Valley

Brannerite FOV 3mm
Brannerite, FOV 2.5mm
Brannerite FOV 3mm
Brannerite, FOV 2.5mm
Brannerite FOV 3mm
Brannerite, FOV 2.5mm

We need for someone to tell us about the specimens from this locality


Brannerite,
Spain,
Andalusia, Córdoba, Hornachuelos, Sierra Albarrana, El Cabril, Dieresis Mine

Brannerite 6.1cm tall
Brannerite 6.1cm tall
Brannerite 6.1cm tall

This mine would appear to have produced by far the largest well formed crystals of Brannerite yet found to date, but we need someone to tell us about them, when they were found, how big they got and how many were found as well as something of the geology of the deposit, associated minerals and the history of the place. Was it in fact a mine?


Brannerite,
Sweden,
Västmanland, Lindesberg, Håkansboda

Brannerite? xls ~1cm polished section,
Brannerite? xls ~1cm polished section,
Brannerite? xls ~1cm polished section,


We need someone to tell us more about these specimens and the locality. Apparently there are micro Arsenopyrites frequently found embedded in these crystals.


Brannerite,
Switzerland,
Ticino (Tessin), Riviera, Lodrino, Iragna

6mm Brannerite crystal in matrix
6mm Brannerite crystal in matrix
6mm Brannerite crystal in matrix

This is what Graeser et al. (1998) in: Mineralienlexikon der Schweiz, Wepf (Basel), 579 pp. say about Brannerite:

"The most important finds of brannerite come from two neighbouring pegmatite veins in a quarry near Lodrino, TI: flattened prismatic crystals to 2 cm, completely metamict, black to brown-black, dull, with traces of yellowish uranium secondaries, associated with (among other minerals) smoky quartz, rutile, ilmenite, scheelite and molybdenite.

Other occurrences of brannerite: In the Lengenbach quarry, one single small brannerite crystal was found as an inclusion in sartorite: elongated crystal, 0.6 mm in length, only partially metamict, with fine expansion cracks. - Brannerite was also found as fine-grained inclusions in uranium minerals of the Mürtschenalp, GL, from the Weisstannen valley, SG, and from trun, GR."

All references to the locality near Lodrino talk about "a quarry near Lodrino", "a quarry between Iragna and Lodrino", "a quarry along the road leading from Lodrino to Iragna", or simply of "Lodrino" or "Iragna", with no mention of a specific quarry. If you look at the satellite view, you can barely make out two quarries that have now overlapped into a large single pit.

Unless we can obtain specific information from somebody who has collected there, we should leave the entry as it is.
Vandal King has a specimen labeled Ghisletta Quarry, Lodrino, Switzerland



Brannerite,
USA,
Colorado, Chaffee Co., Mt Antero

Brannerite in/on aquamarine 5.5cm wide
Brannerite in/on aquamarine 5.5cm wide
Brannerite in/on aquamarine 5.5cm wide


I would be happier about this specimen in the image above if it had had a proper analysis.


Brannerite,
USA,
Colorado, Chaffee Co., Nathrop, Upper Browns Creek area, California Mine

Brannerite, 2.1cm tall
Brannerite, 2.1cm tall
Brannerite, 2.1cm tall

I would like to know who did the ID work on this specimen.



RevisionHistory

Revision no date description editor
1.02009 First Draft Rock Currier




Click here to view Best Minerals B and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.

Rock Currier
Crystals not pistols.



Edited 4 time(s). Last edit at 12/18/2015 01:13PM by Olav Revheim.
Re: Brannerite
April 27, 2010 08:29PM
Hello Rock
In case this is still of interest to you (since your posting dates back a year): The place that produced (and still produces) brannerite along with rutile, molybdenite and some other things in pegmatite is a small quarry among several bigger ones in the Lodrino area that don't have pegmatites. Therefore, one might easily get the quarries confused. However, here's how to get a detailed view of it: Enter "Blonco" on Google Maps; you'll be presented with several choices, among which is in "Iragna, Svizzera". Clicking that, you'll get a close-up view of the orange-roofed houses that belong to the quarry. The quarry is not well visible on the satellite image (there's a spot without trees left of the houses). Need coordinates?
Cheers from Switzerland,
Andy
avatar Re: Brannerite
April 27, 2010 09:23PM
Andy,
Yes I am still interested. Thanks for your note about the quarry that produces the Brannerite. Just to be absolutely sure I know what you are talking about, this small quarry is the only one in the area that has a pegmatite and it is that one that produces the Brannerite rutile, molybdenite and some other things? Does the quarry have a name that would distinguish it from the other quarries? Is it still operating? Are specimens still being found from time to time? How often do the quarry workings intersect the pegmatite?

Rock Currier
Crystals not pistols.
jasper uys
Re: Brannerite
October 18, 2012 05:26PM
hi there Rock
somehow i came across your website,i am from Namibia and have a new location,are you interrested ?
i havent done much yet other than have the samples annylised as brannerite!
would like to hear from you.
regards
Jasper Uys
avatar Re: Brannerite
October 19, 2012 11:53AM
Jasper,
Of course we would be interested in a new Brannerite locality. Can you give us the particulars and perhaps send some pictures?

Rock Currier
Crystals not pistols.
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