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
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
We need for someone to tell us about the specimens from this locality
Brannerite,
Spain,
Andalusia, Córdoba, Hornachuelos, Sierra Albarrana, El Cabril, Dieresis Mine
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
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
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
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
I would like to know who did the ID work on this specimen.
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.
Brannerite
(U4+,Ca)(Ti,Fe3+)2O6
Monoclinic
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
We need for someone to tell us about the specimens from this locality
Brannerite,
Spain,
Andalusia, Córdoba, Hornachuelos, Sierra Albarrana, El Cabril, Dieresis Mine
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
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
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
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
I would like to know who did the ID work on this specimen.
RevisionHistory
Revision no date description editor1.02009 First Draft Rock CurrierClick here to view Best Minerals B and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.
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