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Carlosbarbosaite

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Formula:
(UO2)2Nb2O6(OH)2 · 2H2O
Generally contains some Ca and Si; formula also given as (Ca0.5□0.5)(UO2)2(Nb5+Si)O6(OH)2.2H2O
System:
Orthorhombic
Colour:
Cream to pale yellow
Name:
In honour of Carlos do Prado Barbosa (1917–2003).
Structurally similar to holfertite.

Classification of Carlosbarbosaite

Approved 2010
mindat.org URL:
http://www.mindat.org/min-41099.html
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First Recorded Occurrence of Carlosbarbosaite

General Appearance of First Recorded 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

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Cream to pale yellow
Streak:
Yellowish white
Density:
4,713 g/cm3 (Calculated)
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 Data:
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:
(UO2)2Nb2O6(OH)2 · 2H2O

Generally contains some Ca and Si; formula also given as (Ca0.5□0.5)(UO2)2(Nb5+Si)O6(OH)2.2H2O
Essential elements:
All elements listed in formula:

Other Names for Carlosbarbosaite

Name in Other Languages:

Other Information

Health Risks:
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

Localities for Carlosbarbosaite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Mineral and/or Locality  
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