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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
Colour:
Cream to pale yellow
Lustre:
Vitreous
Specific Gravity:
4,713 (Calculated)
Crystal System:
Orthorhombic
Name:
In honour of Carlos do Prado Barbosa (1917–2003).
Structurally similar to holfertite.


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Classification of CarlosbarbosaiteHide

Approved
Approval Year:
2010

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.

Synonyms of CarlosbarbosaiteHide

Other Language Names for 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.
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 CarlosbarbosaiteHide

Localities for CarlosbarbosaiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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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