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Carlosbarbosaite

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About CarlosbarbosaiteHide

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
Colour:
Cream to pale yellow
Lustre:
Vitreous
Specific Gravity:
4,713 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honour of Carlos do Prado Barbosa (7 January 1917, Alfenas, Minas Gerais, Brazil - 7 April 2003), chemical engineer, mineralogist, and mineral dealer. In his early career, he worked at the National Institute of Technology in Rio de Janeiro, Brazil. As a dealer, he was known for bringing many rare and unusual species to market. He was a co-author of the descriptions of bahianite and minasgeraisite-(Y).
Structurally similar to holfertite.


Classification of CarlosbarbosaiteHide

Approved
Approval Year:
2010
First Published:
2012

Pronounciation of CarlosbarbosaiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of CarlosbarbosaiteHide

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

Chemical Properties of CarlosbarbosaiteHide

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

Crystallography of CarlosbarbosaiteHide

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 V:
1,107.43 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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)

Type Occurrence of CarlosbarbosaiteHide

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.
Place of Conservation of Type Material:
Museu de Geociencias, Instituto de Geociencias, Universidade de Sao Paulo, Rua do Lago, 562, 05508-080 Sao Paulo, Brazil, number DR707.

Microgram portions are housed in the Systematic Reference Series of the National Mineral Collection at the Geologica
Reference:
Atencio, D., Roberts, A.C., Cooper, M.A., Menezes Filho, L.A.D., 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. and 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: 75-90.

Synonyms of CarlosbarbosaiteHide

Fluorescence of CarlosbarbosaiteHide

Other InformationHide

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 CarlosbarbosaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Atencio, D., Roberts, A.C., Cooper, M.A., Menezes Filho, L.A.D., 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. and 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: 75-90.

Internet Links for CarlosbarbosaiteHide

Localities for CarlosbarbosaiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil (TL)
 
  • 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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