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Carlosbarbosaite

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Formula:
(UO
 
2
)
 
2
Nb
 
2
O
 
6
(OH)
 
2
· 2H
 
2
O
Generally contains some Ca and Si; formula also given as (Ca0.5□0.5)(UO2)2(Nb5+Si)O6(OH)2.2H2O
System:OrthorhombicColour:Cream to pale yellow
Name:In honour of Carlos do Prado Barbosa (1917–2003).


Structurally similar to holfertite.

Classification of Carlosbarbosaite

IMA status:Approved 2010
mindat.org URL:http://www.mindat.org/min-41099.html
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Type Occurrence of Carlosbarbosaite

Type Locality:Jaguaraçu pegmatite (José Miranda mine; José Pinto mine; Carneirinho mine), Jaguaraçu, Minas Gerais, Brazil
General Appearance of Type Material: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.

Physical Properties of Carlosbarbosaite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Cream to pale yellow
Streak:Yellowish white
Density (calculated):4,713 g/cm3
Comment:D(calc): 4.713-4.712

Crystallography of Carlosbarbosaite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Cmcm
Cell Parameters:a = 14.150(6) Å, b = 10.395(4) Å, c = 7.529(3) Å
Ratio:a:b:c = 1.361 : 1 : 0.724
Unit Cell Volume:V 1,107.43 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
8.405 (80)
7.081 (100)
4.201 (90)
3.333 (60)
3.053 (80)
2.931 (70)
2.803 (60)
2.589 (50)

Chemical Properties of Carlosbarbosaite

Formula:
(UO
 
2
)
 
2
Nb
 
2
O
 
6
(OH)
 
2
· 2H
 
2
O


Generally contains some Ca and Si; formula also given as (Ca0.5□0.5)(UO2)2(Nb5+Si)O6(OH)2.2H2O
Simplified for copy/paste:(UO2)2Nb2O6(OH)2·2H2O
Essential elements:H, Nb, O, U
All elements listed in formula:H, Nb, O, U

Other Names for Carlosbarbosaite

Synonyms:
IMA2010-047
Other Languages:

Other Information

Fluorescence in UV light:None.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Carlosbarbosaite

Reference List:

- +
Atencio, D., Roberts, A.C., Cooper, M.A., Menezes Filho, L.A.D., Coutinho, J.M.V., Stirling, J.A.R., Ball, N.A., Moffatt, E., Chaves, M.L.S.C., Brandaõ, P.R.G. and Romano, A.W. (2010) Carlosbarbosaite, IMA 2010-047. CNMNC Newsletter No. 7, February 2010, page 28; Mineralogical Magazine, 75, 27-31.

D. Atencio, A. C. Roberts, M. A. Cooper, L. A. D. Menezes Filho, J. M. V. Coutinho, J. A. R. Stirling, K. E. Venance, N. A. Ball, E. Moffatt, M. L. S. C. Chaves, P. R. G. Brandão, and A. W. Romano (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, 75-90.

Internet Links for Carlosbarbosaite

Search Engines:
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  • External Links:
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  • Look for Carlosbarbosaite on Athena Mineralogy
  • Look for Carlosbarbosaite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Rare and Unusual minerals at Mineralogical Research Company
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  • Localities for Carlosbarbosaite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Brazil
     
    • Minas Gerais
      • Jaguaraçu
    Atencio, D., Roberts, A.C., Cooper, M.A., Menezes Filho, L.A.D., Coutinho, J.M.V., Stirling, J.A.R., Ball, N.A., Moffatt, E., Chaves, M.L.S.C., Brandaõ, P.R.G. and Romano, A.W. (2010) Carlosbarbosaite, IMA 2010-047. CNMNC Newsletter No. 7, February 2010, page 28; Mineralogical Magazine, 75, 27-31; D. Atencio, A. C. Roberts, M. A. Cooper, L. A. D. Menezes Filho, J. M. V. Coutinho, J. A. R. Stirling, K. E. Venance, N. A. Ball, E. Moffatt, M. L. S. C. Chaves, P. R. G. Brandão, and A. W. Romano (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, 75-90.
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