Where it forms, where it's found
- Type locality
- Jaguaraçu pegmatite
- Jaguaraçu
- Minas Gerais
- Brazil
-19.6499°, -42.7464°
7recorded occurrences
Radioactivity
Physical
- Transparency
- Transparent · Translucent
- Colour
- Cream to pale yellow
- Streak
- Yellowish white
- Density
- 4,713 g/cm³
Optical
- UV response
- None.
Crystallography
- Space group
- #50
- Cell parameters
- a = 14.150(6) Å · b = 10.395(4) Å · c = 7.529(3) Å
- Ratio a:b:c
- 1 : 0.735 : 0.532
- Type-locality form
Long flattened lath-like crystals with a very simple orthorhombic morphology. The crystals are elongated along [001], flattened on (100) and up to 120 μm long and 2–5 μm thick.
Crystal structure
Chemical composition
Synonyms
- Carlosbarbosaiet
- IMA2010-047
In other languages
- German
- Carlosbarbosait · IMA 2010-047
- Italian
- carlosbarbosaite
- Portuguese
- Carlosbarbosaita
Classification
Strunz
10th ed.4.GB.75
- 4OxidesClass
- 4.GUranyl HydroxidesDivision
- 4.GBWith additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedraGroup
- 4.GB.75CarlosbarbosaiteSpecies
Literature, links & citation
Citations
- 2011Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2010, CNMNC Newsletter No 7. Mineralogical Magazine, 75 (1) 27-31 doi:10.1180/minmag.2011.075.1.27 DOI: 10.1180/minmag.2011.075.1.27
- 2012Atencio, D., Roberts, A. C., Cooper, M. A., Filho, L. A. D. Menezes, Coutinho, J. M. V., Stirling, J. A. R., Venance, K. E., Ball, N. A., Moffatt, E., Chaves, M. L. S. C., Brandão, P. R. G., Romano, A. W. (2012) Carlosbarbosaite, ideally (UO2)2Nb2O6(OH)2·2H2O, a new hydrated uranyl niobate mineral with tunnels from Jaguaraçu, Minas Gerais, Brazil: description and crystal structure. Mineralogical Magazine, 76 (1) 75-90 doi:10.1180/minmag.2012.076.1.75 DOI: 10.1180/minmag.2012.076.1.75
- 2014(2014) Carlosbarbosaite. Handbook of Mineralogy. Mineralogical Society of America
- 2023Lira, Raúl, Parra, Francisco J., Biglia, Marco E., Morello, Orquídea, Guereschi, Alina B. (2023) Genesis and New Mineral Chemistry Data of Carlosbarbosaite, a Potential U and Nb Ore Source from Miarolitic-, A-Type Granites and NYF Pegmatites of the La Chinchilla Pluton, Velasco Ranges, La Rioja, Argentina. The Canadian Journal of Mineralogy and Petrology, 61 (5) 927-964 doi:10.3749/2300008DOI: 10.3749/2300008
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Carlosbarbosaite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/carlosbarbosaite-41099},
note = {Accessed 2026-05-11}
}